Crypto Wallet in their native currency? You do know right Crypto and Native currencies are two different things? I'm pretty sure there are multiple wallets out there that provide the same service and pretty reputed ones like Coinbase.

What do you want your wallet to achieve that isn't currently supported by the existing wallets? Also, why would you want a crypto wallet to be anything else than a crypto wallet? Electrum - Ask them to use Electrum.