Page through these framebuilders and see if any of them would fillet those seatstay ends over:

SF Bay Area/NorCal Bicycle Frame Builders | yojimg.net

Mind, the $60 quote isn't bad, given that you were going to have it powdercoated and beautified anyway. It's not really worth it to do it to one of these frames - but, since it fits and you enjoy it, that's all that really matters. Go for it.

-Kurt