basically, if there was some kind of post-deep artifice skill that costed like 500k+++ LP or a post-miner credo that included a bonus that allowed us to construct supports out only rock and repair them out of only rock I would bee-line for this.
Having a metal sink like supports isn't necessarily terrible or "costly," this is just a pure convenience thing. Cutting logs or carrying nuggets to repair shit as a miner is pretty annoying. I would pay handsomely to be able to build a support I can repair with rocks.
Alternatively, maybe some kind of beltable bag that holds nuggets????