Is there anybody who actually uses a front derailleur that doesn't look at chainline and trim at least occasionally? I would re-write this question as:

"I would like to be oblivious to part of the critical function of my many speed bike, can someone help me please?"

If chainguards and clean dress pants are your deal, just follow the Dutch and opt for as many speeds as you'd like way out back and no front derailleur at all. Not that there's anything wrong with that, BTW.