Thanks for the input, everyone! It is greatly appreciated.

My use case is that I am trying to help a young man with an intellectual disability to operate his TV. He keeps breaking his physical remote controls and whilst I try and source a new one, I am looking for a remote control app to install on my personal phone so I can at least turn the TV on for him.

I will try out KDE Connect and will also look into the Android Remote App (although no longer maintained). If this all fails, I will look into a hardware solution.

Thanks again!