The bluetooth problem predated the installation of the replacement keyboard.
Anyway, I'm not going to fight for this, I'm just saying my "Linux desktop for non-technical users" experience in 2023-2025 timeframe was such that I don't know that I would do it again, and certainly would be extremely hesitant to recommend it to a household where no one is standing by with the willingness and aptitude required to tackle a boot-to-grub situation.
You plugged a chinese knockoff… there, found your problem.
Unfortunately most hardware is not done in a way to work properly when there's a bad device connected to the same BUS.