[Aim to maim]

First, I'm very sorry to hear about your vision loss. That must be a real challenge, but it sounds as though you're dealing with it well.

Your time and money would be much better expended learning to shoot left handed. For what an offset scope mount or stock would cost, you should be able purchase several rounds of practice ammo.

I've not had to go through the process myself, but a couple of my acquaintances have changed from right to left or vice-versa and with some practice, they now shoot as well as they ever did.