Kinda in the same boat, after trying to make so many different 64/65 cm frames work, I have come to the conclusion that nothing under 66cm in a vintage geometry is comfortable.

I plan to keep the 3 vintage road bikes that I do have and if I do add anything else it would be a more modern cross bike that I would not mind taking on the trails. I know I have nothing that is truly collectible, but I hate taking the older bikes trail riding if that makes any sense. I don't have any desire for anything carbon fiber or aluminum, steel will always be my first choice.