Hey jp, I found my shaft drive drain thread had been stripped when I first did all the oils in my ownership seven years ago and still haven't done a permanent fix. Initially I was kind of amazed it hadn't loosened itself and fallen out beforehand. Back then I re-tapped the drain plug internal thread with the bike on the centre stand, pretty inaccurate but it sharpened up just enough to have the plug thread up (reusing the two existing washers that were on the plug ).
Obviously that wasn't going to last and I persevered with a weeping plug for the last three or four oil changes before it got too bad to be a concern. I tried plumbing thread tape but that was no good, now I have it sealed with Loctite thread sealant, meant for steam pipes, did that less than a year ago so haven't had the need to change the oil yet and can't tell you if the plug's reusable but I presume it should be able to be taken out, plug threads cleaned up and re-applied again. I'll repost with a result in a month or three. It has however definitely stopped the oil weep!
Reading Tony's post I wish I'd had the nerve to helicoil it when I had the final drive unit off the bike to replace the swing arm/ final drive gasket which was weeping also, I didn't because I was afraid the swarf would get in the final drive... I should've asked the question at the time as it sounds like you can flush out the swarf relatively easily.
A helicoil isn't too hard to do.
I'll post the Loctite thread sealant number when I get to my garage next, in a day or two.