Our solution turned out to be pretty simple, and might work
for you depending on the shape and size of the locker.
We normally do not anchor with more than 100' of chain, although I have 400'. I dumped all the chain onto the dock
and carefully lay the first 250' into a pile in the base of the locker, piling it up a bit on the edges leaving a bit of an indentation in the middle. The final 150' now is insufficient to create a high enough pile when raised in the normal manner to back up to the hawse pipe.
Worked for me.