I have a really nice and very expensive crank arm that due to a shops negligence, stripped the removal threads on. Long story short, the shop isn't covering their goof up. They removed it, but in the process stripped the treading.

I'm wanting to put it back on a bike but wondering what are some options to remove it in the future without damaging the cranks.

All that comes to mind is to use a gear puller and see if that works.