In fact for bitcoin wallets such a possibility already exists for a long time, and I see its possible to buy tokens for Bitcoin, ETH, Litecoin, Dashcoin, BitcoinCash on your platform. Why do you focus on MyEtherWallet?
Because AZS and AZ tokens comply with the ERC-20 standard and will be transferred to Ethereum wallets. That is, if an investor purchases AZS for bitcoins, he still will have to create Ethereum wallet to receive tokens. And if he buys AZS for ETH, then everything can be done within the same purse - we consider its more convenient and safe. But, of course, the decision is made by an investor.