I really can't agree with this. The major element in being a competetive industrialist is the efficiency - how much cheaper you can produce your goods for. If you're capable of undercutting pretty much everybody else by just having an alt that can produce things better, I think that's really unfair, particularly when someone who plays an industrialist like you suggest will be seriously hurt by the EP they have to put into robot control and the like.
Conversely, it's unfair for an industrialist to have a combat character because it means he can farm his own kernals and decoders. And it's really unfair for people to have separate mining accounts, because then their industrialist is free to concentrate just on maintaining factory lines etc.
And despite this you still see items being sold on the market.
This is largely because setting up a full industrial alt is a lot of work and not everyone is going to bother. Convenience is the oil that lubricates the market machine.
Edit: Having said that, I read the OP again and my main criticism of your idea is that it would also hurt industrialists by requiring them to grind more than a combat character, who doesn't need a faction bonus for anything at all.