I use a Stream Deck to control BIAB. Using that I can assign any keyboard shortcut to a button. While it can send out MIDI ccs, I mainly use it to assign keyboard shortcuts to buttons on many of my programs. So not only can I do the transport, I also have buttons for Regen/Play, StylePicker, song settings, preferences, bar settings, preferences, and so on.

The various Stream Decks connect to the PC/Mac via USB, but you can also get an iOS app for Stream Deck. It comes free with a few buttons, but you have to pay for more buttons. The advantage is that you can control BIAB wirelessly,

The other thing is that the buttons automatically change whenever you switch programs. I use it for BIAB,Cubase, Photoshop,Premiere, Synth, but mainly I have a ton of buttons for websites I often go to. I have a Stream Deck XL and Stream Deck +

https://www.elgato.com/us/en/p/stream-deck-xl

But there are many versions at different price points, with the iOS app the cheapest.

Check out my YouTube video on BIAB at https://youtu.be/_vel48tBLKY
and please subscribe to my channel.