String quilts may be your best options since you can use strips that are very narrow to very wide. You can sew on your foundation piece and worry about trimming up once your hand has healed somewhat. I recently went through carpal tunnel surgery in both hands and trigger fingers were also repaired in 6 fingers and one tendon in the right hand was repaired. I couldn't get over how much better things are. I still have one other issue on the right hand but that has to wait and take serious consideration on whether the outcome is going to be worth the surgical risk. So I am still thinking about it.
I was not out of commission for more than 4 weeks. I did not, of course have the nail problem that you have. That may put you aut a bit longer. You will surprise yourself on how much you might be able to do and you are mending. Best of luck.