They do make - I have them in my kitchen and bathroom - electric floor heaters that you can put UNDER tiles...
Mine have thermostats just like a furnace. They DO NOT heat quickly - this is a very slow heat and not to be used like an off and on switch. We turn them on for the "winter months" and then turn them off.
I think that would be an expensive solution for a "shop".
My solution would be to heat the shop 24/7 so that everything gets up to temp and then will hold the heat --- rather than going out there - cranking the gas on - and expecting all that cold steel to suddenly get comfortable.
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