Here's one I tried about a year ago when a customer brought a bike to me with a stripped oil filter cover bolt.
Repairing it with a Helicoil or Timesert would have involved exhaust removal just to get the clutch cover off.
He didn't have the time to wait for that and a longer bolt had already been tried, and stripped.
So I took the existing bolt, which was ok, and with a sawblade cut a slot in the end of the bolt at the bottom of the threads. Then I laid 0.5mm safety wire in the slot and wrapped it towards the bolt head in the valley of the threads. Looked like a helicoil that came out when I got done. No pic, but I can mock one up if need be.
I then screwed the bolt back into the stripped hole. Went in a bit snug, but never felt like it was going to seize.
Tightened it to about 6-7 Lbs/ft and sent him on his way.
He just called me today asking whether he could bring the bike by for an oil change.
I asked whether he ever got the stripped hole repaired and he said no, it's been working fine.
All you have to carry with you is a length of hacksaw blade and a length of 0.5mm wire and you're set.
Both items are easy to carry and probably a good idea to have with you anyway.