yah its sad i know and this is why i have zero drakes although i have 12 duck hens , zero drakes.
so ok if he stays in drake jail
Give him a mirror or several mirrors in his pen /crate/coop whatever whereever you are keeping him
I found they love to look at themselves
even talk to the drake...
he wont stop but since you have several more hens I would try this:
i would take the overmated hen and one other hen away from him,, let him live with the other 3hens for a while,, maybe he gets used to them,, so when they all go together again he wont overmate that one,, hopefully