[Nexus 7 (2013) Android Development] tungdil:
You probably guessed it... it requires changing the updater script, similar to what was describe here.

Just a bit more editing than before, i.e. removing the lines marked in red below in META-INF/com/google/android/updater-script:

Disclaimer: No warranty that this works for you and, of course, you do everything at your own risk!

assert(getprop("ro.product.device") == "flo" || getprop("ro.build.product") == "flo" || abort("This package is for device: flo; this device is " + getprop("ro.product.device") + "."););
ui_print("Target: google/razor/flo:6.0/MRA58V/2324235:user/release-keys");
[COLOR="Red"]ifelse(is_mounted("/system"), unmount("/system"));[/COLOR]
package_extract_dir("install", "/tmp/install");
set_metadata_recursive("/tmp/install", "uid", 0, "gid", 0, "dmode", 0755, "fmode", 0644);
set_metadata_recursive("/tmp/install/bin", "uid", 0, "gid", 0, "dmode", 0755, "fmode", 0755);
mount("ext4", "EMMC", "/dev/block/platform/msm_sdcc.1/by-name/system", "/system", "");
run_program("/tmp/install/bin/backuptool.sh", "backup");
unmount("/system");
[COLOR="red"]if is_mounted("/data") then
package_extract_file("META-INF/org/cyanogenmod/releasekey", "/tmp/releasekey");
run_program("/tmp/install/bin/otasigcheck.sh") != "31744" || abort("Can't install this package on top of incompatible data. Please try another package or run a factory reset");
else[/COLOR]
mount("ext4", "EMMC", "/dev/block/platform/msm_sdcc.1/by-name/userdata", "/data", "");
package_extract_file("META-INF/org/cyanogenmod/releasekey", "/tmp/releasekey");
run_program("/tmp/install/bin/otasigcheck.sh") != "31744" || abort("Can't install this package on top of incompatible data. Please try another package or run a factory reset");
unmount("/data");
[COLOR="red"]endif;
[/COLOR]show_progress(0.750000, 0);
ui_print("Patching system image unconditionally...");
block_image_update("/dev/block/platform/msm_sdcc.1/by-name/system", package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat");
ui_print("Verifying the updated system image...");
[COLOR="red"]if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "28,0,32767,32768,32770,32825,32827,33307,65535,65536,65538,98304,98306,98361,98363,98843,131071,131072,131074,163840,163842,163897,163899,164379,168327,196608,196610,197090,215039") == "970256b726054772466653812647eaf50ddf8dfe" then
if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "34,32767,32768,32770,32825,32827,33307,65535,65536,65538,66050,97792,98304,98306,98361,98363,98843,131071,131072,131074,131586,163328,163840,163842,163897,163899,164379,168327,168839,196096,196608,196610,197090,215039,215040") == "3c55b4dff8589604d8415155d43f0c20ee30e799" then
ui_print("Verified the updated system image.");
else
abort("system partition has unexpected non-zero contents after OTA update");
endif;
else
abort("system partition has unexpected contents after OTA update");
endif;
[/COLOR]show_progress(0.020000, 10);
mount("ext4", "EMMC", "/dev/block/platform/msm_sdcc.1/by-name/system", "/system", "");
run_program("/tmp/install/bin/backuptool.sh", "restore");
unmount("/system");
show_progress(0.050000, 5);
package_extract_file("boot.img", "/dev/block/platform/msm_sdcc.1/by-name/boot");
show_progress(0.200000, 10);
ui_print("Writing bootloader...");
package_extract_file("bootloader-flag.txt", "/dev/block/platform/msm_sdcc.1/by-name/misc");
package_extract_file("bootloader.sbl2.img", "/dev/block/platform/msm_sdcc.1/by-name/sbl2");
package_extract_file("bootloader.sbl3.img", "/dev/block/platform/msm_sdcc.1/by-name/sbl3");
package_extract_file("bootloader.tz.img", "/dev/block/platform/msm_sdcc.1/by-name/tz");
package_extract_file("bootloader.rpm.img", "/dev/block/platform/msm_sdcc.1/by-name/rpm");
package_extract_file("bootloader.aboot.img", "/dev/block/platform/msm_sdcc.1/by-name/aboot");
package_extract_file("bootloader-flag-clear.txt", "/dev/block/platform/msm_sdcc.1/by-name/misc");
package_extract_file("bootloader.sbl2.img", "/dev/block/platform/msm_sdcc.1/by-name/sbl2b");
package_extract_file("bootloader.sbl3.img", "/dev/block/platform/msm_sdcc.1/by-name/sbl3b");
package_extract_file("bootloader.tz.img", "/dev/block/platform/msm_sdcc.1/by-name/tzb");
package_extract_file("bootloader.rpm.img", "/dev/block/platform/msm_sdcc.1/by-name/rpmb");
package_extract_file("bootloader.aboot.img", "/dev/block/platform/msm_sdcc.1/by-name/abootb");

Flashed as secondary ROM, booted without problems, seems to work fine but I cannot say anything about stability or risks...

BTW: Removing the first three blocks might not really be required but I was just too lazy for testing it. Probably someone else can test it and report here?

---------- Post added at 11:15 PM ---------- Previous post was at 10:38 PM ----------

Well ... not the original kernel, but [MENTION=3847629]Tk-Glitch[/MENTION] 's Kernel - r362 will work.

[MENTION=5909275]Wannabedeveloper[/MENTION]

I should probably have mentioned that you'd need the modified MultiROM.