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Some reflections:
A bolt-on altermotor system will be cheaper than something custom or requiring fabrication. I don't think you started the thread wanting more power and AWD, just more economy in a car you plan to drive every day, so the bar for what you're expecting to get out of it (and the costs) has moved. I'm still going to propose that simply bolting a small motor on in place of your alternator and putting a small battery in the trunk will give you more power and better fuel economy, and won't require a shop to do a lot of expensive custom work.
You can get basically the same economy out of just changing your driving habits. funkhoss has proven that using an engine kill switch frequently, being very gentle on the throttle and driving conservatively can deliver phenomenal economy, even in a car with a big motor like yours, but in my opinion hybridizing is having your cake and eating it to. I think if you keep it simple it's a very realistic goal, and would caution you that while min/maxing is interesting, you may find that in practice it becomes too expensive or complicated to be reasonable. Having a university do custom hub motors is not going to be cheap.
What I'll advise really depends on how much money you want to spend, and what you're hoping to achieve.
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