If there are no sliding fields used in your layout, it's possible, but takes a fair amount of work to set up.
You have to add in another sub summary part and sorting on a second "page" field with a script or possibly some calculation fields that use the number of records in each group to compute cases where a page break needs to be forced to keep as much of your group of records with sub summary parts on one page as possible.
Yeah, I don't think that's gonna work as the notes field is just one text field and could have just a few words or several sentences worth of text. As stated by the OP in the other thread (which I forgot to link to, Printing sub-summary records on the same page), there needs to be a "Don't allow sub-summary records to break across page boundaries" command.
Oh well - thanks for responding!