[g.willikers]

The transition with bifocals proved to be as you describe.
Too much confusion when just tilting my head, let alone trying to find the right combination for shooting.
I went with a division of lenses, but right and left instead of up and down.
Right lens for the sights and left one for the target.
Works much better, at least for me.
And it didn't even require the expense of an eye doctor.
Just two eye glasses from the drugstore rack, with suitable lenses installed in one frame.
Cheap and effective.
Maybe not so hot for other things, but for shooting, they're great.