Just make sure you repair your drones each time, they can get shot up fairly bad and eventually get popped if you're not paying attention.

If you want a third account anyways I'd suggest using the buddy program to start a new account from one of your current ones and train up another hulk pilot. That extra hulk will make you a lot of difference to your bottom line, a lot more than a ratter ever will. Then once the hulk pilot is trained you can add an extra character to that account and train for combat ships.

I have been boxing 4-5 accounts for mining (3 hulks, rorqual and/or hauler) and that works fine.