Got first-ish iteration of case rolled out.

Initially the idea was to print idler wheels and main encoder wheel to then be taped by something that provides enough friction to stay in place and not give much way and then also transfer rotation to encoder.

Turns out it does not really work that way. You can tape your wheels alright, but you probably won't be able to do something like that to an inside diameter of the bezel wheel - tape will not stick in that configuration.

So I guess i will have to calibrate my printer and dip my toes into gear design, however cursed that sounds for now.