After Acrobat failed to install on my Windows VM, I installed it on Arugula, and attempted to massage the two-page extracted TOC into a single page. No joy. You simply don't have enough editing control in Acrobat to do this kind of thing. So then I hatched a cunning plan to write a special TOC output routine in XSLT to generate a shorter version of the TOC just for the cover. However, it turned out (obviously, when you think about it), that the TOC is part of the page numbering; so if you generate the volume with the page refs resulting from the reduced one-page TOC at the beginning, they're different from those in the original volume, so the TOC is wrong.

Finally, I went back to Illustrator, and modified the first extracted page -- Illustrator is happy to let you edit the text -- and built a one-page version in there, then added it into the cover file. Sent a proof copy to JT and HT.