I have the same problem, and I can write code if needed. Still using a TSU7000, combined with Google Home and Home Assistent i can handle all my needs.

Already have replaced it 2 times, but secondhand devices are impossible to find now. I considered Logitech as an alternative, but that option is gone now.

So I am also looking for a safe way out. Preferable a remote with some hard buttons and a programmable GUI, ideally with IR/IP/Bluetooth options - and some way to set up my own custom screens, import IR codes etc. Essentially, what my current Pronto does, but a bit better..

The only thing I can find that comes close is Sevenhugs (although without hard buttons and with a very small screen). So any ideas?