[Paid Software Announcement and Discussion] lottjam11:
With this release I was able to make it all work. It takes a little over a minute from the time I start the car until the MK809V boots up and starts the hotspot. There was very little skipping/lagging when I did a short test drive around town. I played Pandora and the SiriusXM apps while using Waze for navigation.

I did encounter a couple issues. The first is that the phone won't switch to the HUR hotspot if I'm in range of my home WiFi (like in the garage). I used MacroDroid to force the switch to HUR anytime it's SSID is broadcast, so this wasn't a big deal.

The bigger issue is that when I shutoff the car and the MK809V powers off, the phone won't reconnect to my home WiFi. It tries briefly, but immediately drops and tries over again (indefinitely). I noticed that the Headunit Reloaded WiFi Service keeps running after disconnecting from the HUR hotspot. If I manually Exit from it thru it's notification, my home WiFi connects immediately. It would be nice if the service would stop automatically.

Master: Samsung Galaxy S9 (unrooted) with Android 10. WiFi Launcher v2.3 installed.

Slave: MK809V TV Stick (factory rooted) with Android 5.1. AAGateway v2.2 installed.

Vehicle: 2019 Ford Mustang with Sync3

---------- Post added at 07:15 PM ---------- Previous post was at 06:58 PM ----------

By the way, I did disable a bunch of apps on the MK809V. There are probably a couple more I could disable based on the list from the OP.

Here is what I left ENABLED:

root@HX_3229:/ # pm list packages -e

package:android

package:com.android.apkinstaller

package:com.android.providers.settings

package:com.android.inputdevices

package:com.android.packageinstaller

package:com.android.inputmethod.latin

package:com.android.settings

package:uk.co.borconi.emil.aagateway

package:eu.chainfire.supersu

package:com.android.shell

package:com.android.systemui

package:com.amlogic.mediaboxlauncher

package:com.android.bluetooth

Here is what I DISABLED:

root@HX_3229:/ # pm list packages -d

package:com.android.providers.telephony

package:com.android.providers.calendar

package:com.android.providers.media

package:com.google.android.onetimeinitializer

package:com.mxtech.videoplayer.pro

package:com.android.wallpapercropper

package:com.android.documentsui

package:com.android.galaxy4

package:com.android.externalstorage

package:com.android.htmlviewer

package:com.android.quicksearchbox

package:com.android.mms.service

package:com.hx.guardservice

package:com.android.providers.downloads

package:com.android.browser

package:com.google.android.configupdater

package:com.android.defcontainer

package:com.android.providers.downloads.ui

package:com.android.vending

package:com.android.pacprocessor

package:com.android.certinstaller

package:android.rockchip.update.service

package:com.android.contacts

package:com.android.camera2

package:com.android.rockchip

package:com.android.backupconfirm

package:com.rockchip.gamecontrolsetting

package:com.android.wallpaper.holospiral

package:com.android.calendar

package:com.android.phasebeam

package:com.android.sharedstoragebackup

package:com.hx.launcher

package:com.google.android.email

package:com.android.printspooler

package:com.android.dreams.basic

package:com.android.webview

package:com.android.musicfx

package:com.android.onetimeinitializer

package:com.android.server.telecom

package:com.android.keychain

package:com.android.gallery3d

package:com.google.android.gms

package:com.google.android.gsf

package:com.google.android.partnersetup

package:com.svox.pico

package:com.android.proxyhandler

package:com.netflix.mediaclient

package:com.google.android.feedback

package:com.android.musicvis

package:com.android.managedprovisioning

package:com.android.rk.mediafloat

package:com.android.dreams.phototable

package:com.android.noisefield

package:com.google.android.gsf.login

package:com.android.smspush

package:com.android.wallpaper.livepicker

package:com.cghs.stresstest

package:com.google.android.backuptransport

package:jp.co.omronsoft.openwnn

package:com.android.calculator2

package:com.droidlogic.mboxlauncher

package:com.android.wallpaper

package:com.android.vpndialogs

package:com.hx.videotest

package:com.rockchip.mediacenter

package:com.android.music

package:com.android.phone

package:com.android.providers.userdictionary

package:com.android.location.fused

package:com.android.deskclock

package:com.android.Listappinfo

package:com.android.exchange

package:com.DeviceTest

package:com.android.providers.contacts

package:com.android.captiveportallogin

package:android.rk.RockVideoPlayer

package:com.cloudtv