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Yep, I realised that. I also think it has as much to do with track being a different game for the manufacturers. They don't need to make a road frame as light as 800g or whatever some of them are but they do it to compete with the other companies. That competition doesn't exist in track frames.
In reality the UCI limit should be lower for track anyway due to absence of gears and brakes!

But for the reasons you state, I shall never have my 1kg track frame.

Custom build you can do what you want. Burls do fixed frames. Get them to build one with track geo for ya.