Using the starter to crank the bolt off seems to have worked for a decent number of people on the internet, but seems slightly dangerous. Heat seems hit or miss on a bolt that is usually torqued well beyond its official torque numbers.
When I encountered the same problem with a Honda crankshaft pulley bolt, I ended up using a 1/2" drive impact gun with a massive, 2 pound impact socket. While I don't fully understand the physics behind it, the added mass makes it more impact-y, or something. After breaking 2 breaker bars trying to get the bolt off with the official pulley holder tool, one of these big sockets got it out in 2 seconds, no holder tool required. I think this would certainly be a safer thing to try, and would work despite being unable to hold the pulley in place
Just need to find one for whatever size bolt that is on the Toyota