I’ve done that in the past but its just too much of a pain trying to pause the TV enough to get the audio in sinc....plus I like the 5.1 audio of the HD game...crowd noise and all.
I get the MLB audio subscription because I work from 7 PM to 7 AM. I can listen to the Red Sox games on my work PC.
It really is a pain not having the TV and radio sync up but I did it during the last Indians / Sox game half the game. I just could not take Joe Buck and McCarver.