Well if you just keep to the key of C you can just play white keys. Some controllers have transposition settings on them! If not you can use a midi effect in yo

Well if you just keep to the key of C you can just play white keys. Some controllers have transposition settings on them! If not you can use a midi effect in your daw to transpose to another key, too. But really if you can already do things on guitar then piano will beat lot easier and probably even help your guitar technique as well.