Today I experimented with “moving” to the UK in my Kobo account. All my store credit moved with me and I was able to buy The Last Hero without issue.
However, it seems to simply use a separate JPG for each page. This wouldn't bother me quite so much except it also does it for the two-page spreads, so I'm toying with the idea of stitching those two-part images together myself and replacing the references in the ebook. Just a bit leery of messing something up, I suppose. Any cautions or words of encouragement from more experienced readers who are also picky about this sort of thing? I guess I can always just make a copy of the original EPUB so that if I mess up I can go back to the original version.