I just scale my regular desktop to 133 or 150% when I plug my laptop to my video projector and use that old cordless keyboard/trackpad combo from microsoft or logitech (can't remember and can't verify right now, thise with a usb receptor) I bought 2 decades ago.

I don't really think a specific TV like interface would make it more user friendly really. It is much faster to browse and select files than on any remote based interface I have ever used on dedicated devices (or video game consoles). Turns out we have never made any better device than a keyboard to type search words :-)

I could use kdeconnect to control a lot of stuff like volume / play/pause / next buttons from my smartphone but I don't even do that as the keyboard+trackpad combo is always available next to me anyway.