I've written what I think is a nifty little PS action that puts the stars back onto a starless layer. I think it's cool, but maybe everyone has already done this and it's nothing new.
So I've got an action that removes stars, I have a bit of a methodology to tidy up the starless image that seemed to work on my test image (not sure if it's practical to be in the star removal action), and now an action to add the stars back as a separate layer so they can be turned on and off. It's all coming together for me. I haven't reverse-engineered the AstroAnarchy way of adding and removing stars, so I don't know if my methodology is similar or different, but it seems to work and I think his actions need a bit of work as sometimes they fall over if your layer naming isn't quite right. (Actually I might email him with fixes for that.
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When I get a chance I'll put it all together in a bit of a tutorial with downloads and screenshots etc.