I think I see evidence that the head tube has cracked. At some point you just have to cut your losses. Or find someone to replace the whole front triangle. The previous owner decided it wasn't worth saving, that's a pretty good data point for me.
The OP is a self answering question in my way of thinking. Either you know it can be saved because you can do it yourself, or it's probably too expensive. Although like I said up-thread, there are people that do repairs for cheaper than the same work on a new frame. Which always has bothered me.