Awesome, so I was on the right train of thought 
Unregistering was one of the things I’d tried to do but couldn’t quite work out what I was doing as the documentation didn’t work! I delved into the code a bit more and found the right reference and now my modal shows instead of the standard rollback one - a big H5YR @nielslyngsoe
I added a PR to the docs - assuming the way I mention is the right way!