Instead of fixing the tank go get a plastic tub/latchbox/under bed plastic tub. You can use the UTH and t-stat from the tank for it, and wrap a nylon non-stretchy luggage strap or cargo/camping tie-down around the middle so the snake can't escape by flexing the tub in the middle of the long side.
Going to second this suggestion. Seems to be the best thing you can do on such short notice. Worry about the tank later and just focus on getting the snake into some stable conditions. Glad everyone is okay, though. That's crazy.