I haven’t had a gopher problem, so this is probably a shot in the dark, but…
I used to have a problem with rabbits eating my hostas (ok they still do sometimes).  I knew where their den was, so I started using that spot as a receptacle for my dog’s poop after yard cleanups.  It worked pretty well for the rabbits, and that area is no longer a favorite den…
So maybe if you know where the gopher holes are?  And if you have a dog?
Gophers sound like a real nightmare.