Thanks to all for to the 'older Pages' suggestion. I don't have the last Pages on my mac anymore (although this is probably just me being really, really dumb), but the suggestion inspired me to try another very similar work around - which was also successful. Just in case anyone's in the same situation as me, am sharing it here!
For absurd reasons I won't bother to explain, I've also got a version of Word for Mac. I prefer writing on Pages, though, so all my documents (and their comments...) are Pages files. In the really unlikely event that you've also ended up with both Pages and Word (I know...) just export to a .docx file, open it with Word, and print from there. It retains all comments, track chages, etc. This seems really obvious, but I hadn't thought of it...
This can also be a work around for the lack of 'Compare Documents' and/or 'Merge Documents'.
Of course this would all be much better if it were actually just in Pages...I hope this helps, and thanks!