Yes, they can be disassembled... just take your time and be careful.
The lettering is actually in the plastic and not on the black paper. I replaced the paper on mine with black plastic,
which I cut out from an old black 3-ring paper binder that I had laying around.
The control knobs DO pull off but it may not be very easy.
I've heard that heating them up a bit with a blow dryer helps, but I haven't tried that.
Mine DID push back on and stayed... but you could always add a drop of non-hardening adhesive.
Good luck and have fun!