Yep shielded wire is stupid expensive ... found that out during my DIY CNC project ... for the moment I'm using conventional multi-conductor with clamp on ferrite cores. I've seen some controls that use pretty skinny cable, 20ga would be good for sure.
Of course adjustable spring tension would be the ****
I'd opt for the heavier tension for me .... gloves on and all that, I'd want to feel the pressure.
When it gets to that point ... let me know, perhaps I can 3d print up some parts.