The race seat is part of the lug. Rebuilding it with a new crown is probably silly. It's so much more work than just building a new fork that you really should just build a new fork instead.

Having said that, I wouldn't do either one. Silverbraze outlines a much simpler method, and in fact I have seen ready-made rings for just such an application.

Personally, I have run into the same troubles as you on several occasions and have had perfect results by dimpling the existing seat with a center punch as outlined by Peterpan. I don't even bother with the Locktite. If that is too low tech for you, Stein makes a knurling tool just for the job. It's quite expensive for what it is, but it's still less than having a fork made (or remade).

HTH!