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SC cable is unpower until it communicates with the car so fishing is safe. I've fished several plastic pin shrouds out of SC, sometimes the stall works, sometimes not. Depends on if it was reported as NOP to Tesla.
I use the same drive. It seems to work most of the time but when the SW is updated it stops for a day or two. Soft resets don't seem to fix it, then it starts working again.
St George is a bit off the I15 so expect to drive a mile or two on surface streets. Starbucks with bathrooms nearby and a few other places within a block.