I have a One for All remote that has a learning function, no connectivity required. Works great. Not sure if their other remotes are the same, but the small one is great for me.

Flipper Zero has a universal remote mode, and for codes not in the database they can even learn commands from your other remotes.

KDE Connect allows your phone to become a remote for Windows and Linux PCs.

If your home theatre setup uses either OS and you own an Android phone then this could be a free potential alternative

Hope this helps!

Edit:

• KDE Connect currently doesn't have the option to change video inputs

Kodi specific, but it works well.

https://yatse.tv/

I've been trying to build one to replace my Harmony, but the IR transceiver seems pretty weak and don't think I have any other options.

Maybe some day.

Synchronicity because I just fixed CEC on my system last night lol

I thibk Flirc. Its been a long time since ive used it though and Linux support was trash.

Don’t bother trying to find one. Universal remotes have always sucked add and always will.