Have a look at this site.
Never tried it myself, so I'm just letting you know of the options available.
Distributors available in a few countries too.

All four spark plugs on my old Airheads are threaded into these little beauties. When I questioned the mechanic I worked with - a helicopter technician - he reminded me that all aluminium-framed helicopters have these inserts in them.

Nice find blakey!

OG

I have used them for my truck

Timeserts are just now arriving down under?  Somebody in marketing must be asleep at the switch. They're been in use in the US for eons.

There should be (if there ain't) a 'the best products you've never heard of' area. 
I'd place Gibbs Brand on it, f'rinstance (no affiliation, etc.)

brickrider wrote:Timeserts are just now arriving down under?  Somebody in marketing must be asleep at the switch. They're been in use in the US for eons.

They have been available for a long time here but not well known

They have been available for a long time here but not well known

My point, exactly.

I've always used timeserts in preference to helicoils. Unfortunately they can sometime be a bit of a PITA to find someone who can do them. One day I'll buy my own kit and tools... one day...

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.