Sorry for your injury, and I hope it heals up properly, but it's also a good reminder. I practice one-handed manipulations and shooting with either hand, though admittedly probably not enough weak-hand only to equal my strong-hand only skill level (such as it is...
).
I have given serious thought to getting a left-hand holster, but it's one thing I haven't done yet. My plan, if my right hand were injured enough to require left-hand carry, is to rely on a snub in a pocket holster on my left side. I do practice this from time to time.
I should add that this is a growing concern for me, as I've had recurring issues with tendonitis in both wrists, and I'm beginning to show early signs of osteoarthritis in my fingers. So far, I can handle my guns without issue (*knock on wood*).