Suggesting to follow SB is not particularly helpful here although I can see the sarcasm in your post.
Issuing release letters by an institution A that hepls an FT to transfer to an institution B does normally not work because tA does not want to do all the hard work and pay the expenses involved just for another institution B to benefit from the same in case the FT intends to move there.

"If you are a competent well-liked teacher they do not want to give you a release letter.
If you are a thorn in their side, they will be more likely to release you. Try dating a few students."