@philcomm First off, I'm sorry that your OSK as originally engineered looks like it won't be accepted --- but I wanted to thank you for really moving the ball forward on this, because it looks like the python-based one will make it through as per recent comments on the PR. This is going to save a lot of people time and frustration and you should get a large chunk of the credit.
For fun last week as I was setting up my Zero2W I connected via SSH to it and attempted to enter Wifi via my phone using the existing infrastructure by executing RetroPie-Setup directly. Although in theory this seemed like a good idea, the WiFi won't drop and reconnect to a new network when you're using that connection for the terminal session, turns out. So, still very clunky.
Will check out your music suggestion, and also the new OSK coming down the pike. Thanks so much.
I think I might have found some quirks around the safe shutdown script with the Zero2W around pin allocation and interaction with WiFi but I want to do some more testing this week before making further topics or inquiries about it here. I also will share some additional script suggestions / observations too.