I have used a clothes-iron for years with the same result, though not so convenient. You have to keep moving the iron, to heat evenly. I have frequently been informed that it couldn't possibly work, as dry hide glue gets harder with heat, but it keeps working anyway.
Works for smaller isntruments a lot faster, obviously, but the same result-- no splitting or tearing.
I did notice that the FB tends to shrink a little, though--it doesn't fit exactly the same, when you go to put it back.