Hmm, that's interesting. Introducing it into the DNA through acid production therapy, that's quite ingenious. But you don't think it might be a bit risky ? If we're off even the slightest bit in the isolation of the gene, or the acid production, it could have disasterous effects... he could grow a new nose, or something :O
And again, you don't think it would be too much for his system to take? I mean, adding a kekki genkai into someone not born with it is quite risky.
We could also introduce the DNA in the form of a laboratory-made virus. And have the virus "infect" his eye cells, and introduce its DNA along with the sharingan gene. Somehow.