I use an Apple bt kb w the c5j6 no prob. I’d rather use the screen for mouse/tpad functions so I don’t need the tpad.
Interesting to me was seeing the kb specific to Teclast phab just beliw your kb on your link.
I do use a kb/tpad combo for my TV boxes. It’s about 10 quid on Amazon (sorry for not providing model as I’m away from it just now). You might find it even cheaper where you are. Even if it didn’t help you, returns are easy, or you might pair it w sth else sometime.