Potentiometers and sharing guitar module

Hi, I’m pretty seriously considering doing a PCB for a bass (or guitar) based on the Daisy Seed. It would just plug into a standard J-bass control cavity and holes. It would use a flat lithium battery and have a built in charger. I’m sure I could spin a variant for other common form factors. So two questions:

First, I’m having trouble finding concentric pcb mount pots and knobs. That way 4 parameters plus volume can be controlled. Standard practice seems to be to order in the 1000s. Any advice here? It’s the main impediment to getting this project going

Second, if I want to share the design open source, how is that usually done?

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