Hmm.. interesting thought but even if you reworked the starter clutch to grab always the gear ratio would spin the "alternator" at a scarey rate of speed. What's the starter ratio now, maybe 5 to 1 ? So at 8000 rpm engine speed the alternator would be spinning 40000 RPM. Yikes!!! Unless you could make more of a modest gearing arrangement for it. Lots of work or maybe use the space there as a "road oven" and slow cook some ribs while you ride to your campout.
Rick