Really appreciate the insight and your experience on this. I’m making a plan now to attack this weekend.Sadly, your worms have fine tastes. Too bad the spray method cannot work for you. Hopefully you don't have too much encrusting this early. If so, check into some different shapes of diamond wire hand saws on Amazon. Made quick work when I had to rehome some colonies.
As to dips, I've used all of them. Bayer, CoralRx, Melafix, Revive... but for AEFW in particular, none compare with KCl in my experience. None of my acros were bothered by KCl unlike CoralRx (which I like for use against MENS).
I have tried ALL of the in tank treatments and had no luck at all. Some people believe it worked for them. I went 0 for 3 on full treatments. Snake oil IMO.