I tried something similar once. the nail on my index finger is quite irregular and cannot be grown out enough to engage the guitar strings. It does not grow uniformly and has a sharp point that catches on everything.

Anyway I applied my own glue on nail and grew the others out. It worked for a while until it caught a string wrong during a particularly exciting and fast piece and tore off of the nail. It didn't take any of the nail with it but it sure felt like it did.