Saw this on CL here in Vancouver (two different sellers, I thought, in a short span of time, though I could be wrong about that).

Just buy it?

A friend actually asked me about this bike several weeks ago, based on the first(?) ad.

My initial thoughts were in line with miamijim and Michael Angelo.

If it holds a (suitably long) post and rides nice as is, I think you've come up with a decent solution already.

Edit: as long as you're not exacerbating the damage, this could give you a chance to evaluate how much it's worth to you to potentially pursue some kind of restoration in future (whether filling with brass, if feasible, or full on tube replacement). What's to lose?

Also, just noticed the date(s) on the posts in this thread. Guess it didn't sell, eh?