I do not know if you already have a web wallet in development, but I find a web wallet something more practical without having to download anything and consume space in HD.
If you don’t like security you are free to use online wallets 
Nanowallet (universal client) consumes couple Megabaits.
Or you asking for wallet for other cryptocurrency?
For NEM crypto
Nanowallet does not download blockchain so it is as fast as web wallet and it is secure (instad of online wallets)
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