You could swap the reg out as they are the same threading.
Is it the new SS reg? You could service the reg yourself or you could contact crossfire about the issue you are having with it.
Usually an easier way to compensate for a long tank is to move your asa forward or purchase a rail if you don't have one so you can move the asa forward. Only because a rail is cheaper then a whole new regulator, especially if you would be looking at a G2 reg which is pretty pricey. And if it's a matter of that inch or two usually just changing the position of the asa is more then enough in most cases.
If you are set on a new reg though you would just have to hand tighten the reg and then use a strap wrench to tighten the reg down beyond then. Ensuring there is no gap between the reg and tank body. That should also ensure that hand strength wouldn't be sufficient enough to remove the regulator.