I think I would just put one of those Big Maxx ceiling furnaces in on propane. Put it on a setback thermostat for overnight. Takes up zero floor space.
They are cheap to buy, easy to install, and work great but horribly expensive to run on propane in the PNW. Propane cost is highly variable by region so if you're lucky enough to live in a cheap lpg area then maybe it's more reasonable.
If my AHJ or insurance company ever change their mind about allowing wood stoves in shops then I would probably just use a propane mod/con boiler to supply the 1800 feet of pex in my insulated slab with hot water. Until then, wood is so much more fun!