Haha I’ve done the same thing before by mistake so no worries :p
OP does have a thermostat for their heatmat so they could adjust the temp HOWEVER I agree the uncertainty of how OP is measuring surface temps is concerning, even more when vacation is limiting options and time for adjustments. Very tricky situation
Not entirely sure how much I’d trust a local pet shop for sitting given how most employees are not knowledgeable and could make things worse. That and the possibility of getting mites. It’s another option at least but not without risks. Unless OP could hire a pet sitter familiar/experienced with snakes to look after them?
OP we wish you luck and hope for the best so when you return from vacation you can get everything sorted if you are unable to before leaving.