🚀 go-pugleaf

I have written a LaTeX style that takes pages in pairs and ships them
out, one on the left hand side of a (landscape) A4 page and the other on 
the right.  This was done by re\defining \shipout to save the left
hand pages in a box, and then call the real \shipout with the 
left and the right hand pages in an \hbox when the right page is complete.

This works fine, except for cross-referencing.  Because the \write commands
are expanded when the double pages are finally shpped out, references to the
page numbers come out with odd pages numbers (the left hand pages) replaced
with the right hand page number.

Is there any way to convince \writes on the left hand pages to occur when the
page is complete and stored in the temorary box rather than when both pages
are shipped out?  

Alternatively, is it possible to replace references to \count0 on the left
hand pages to \count0-1 so that they come out correctly when the double
page goes through TeX's intestinal tract?

Thanks. 

Stephen Simmons