Easier to install, no internet connection, more coins

[OutonanIsland]

Trying to onboard merchants is not easy, I discovered Bitcoin Cash Register and it works great, but it is only the one coin. My onboarding project requires Bitcoin, Litecoin, Monero, Bitcoin Cash and USDC. I found CryptoTerminal randomly on FDroid Classic.
I installed from FDroid and Git APK. Setup was easy, but app would not recognize payment or connect to internet. I then found install instructions on Github, but that info is not in my wheelhouse. I do have some money, what would it take to get this app to have super easy, normal install and with the 5 coins I mentioned above?