I thought about this and looked at a bunch of different options for myself this past fall. Same thing, nice new fiberglass blind, absolutely hate the Coleman can thing with my Buddy heater. Ultimately I ended up with the tank in the blind with me.
I'll think about it again this fall and actually do something, I'll come up through the floor in the far corner from where the heater will most likely be with a bulkhead/low pressure quick disconnect. If I get lazy, which is a real possibility, I'll just get a plain bulkhead fitting and fasten to the floor upside down (flat as possible inside), cut the big propane fitting off, run the hose through from the inside and then put the two pieces together, outside. That way, there's nothing non-factory inside the blind.
M&P-10+AAC Cyclone - Kel-Tec RFB+Griffin Sportsman Ultra Light 300
ATN OTS 336-70mm 60hz Thermal Monocular
ATN OTS 336-30mm 9hz Thermal Monocular
ATN NVM14 NV Monocular