Likely going to give up on this due to script block argument passing losing type.
Trying again without a script block.
Loops through and converts all recordings.  I still need to clean up converted shows.
First complete attempt with script which will delete it to recycle bin.
Changed to a 3 minute buffer.
Removed Concurrently script that did not work and updated Convert All just prior to further cleanup.
Finished documenting Convert All script and configuring debug messages to use $DebugPreference.