Thanks for all the above tips - I've found that Elderly sells some kind of clear adhesive pick guards which I'm investigating. And I'll also look into the Collings guards, thanks Nina!

I probably won't sell this guitar, but who knows, (I'm too old a dog to say Never) and I certainly don't want to diminish its potential value for my great-grandkids in 50 or so years when it truly becomes "vintage". Maybe I should just go ahead and wear a hole in the top like Willie Nelson's old classic... Naah, I think not.