The question then becomes how do you balance it out either you have a droid with one of its major setbacks removed or a human with a whole load of droid bonuses added . Either of these would appear to balance with the rest of the species.
I think that's a discussion for the GM and the player. Though personally I think the "you are also now vulnerable to Ion damage, and can't be healed through medicine, have to use repair kits" is a sufficient drawback. I mean most players consider playing a droid to be a downgrade, that it's just not worth the drawbacks to play one, when you can simply play an organic.