That's a good start and if he ever find something that doesn't satisfy him, at least he knows where to start and probably not from scratch. An open source code would be something to start with, he could just modify something for his needs and the people who sees it will be a follower of his new wallet.

Thinking of the future though, the regulators might find this not ideal and they regulate the wallets too. AFAIK MiCA was planning to.