Thanks Nick,
I should have specified that I've looked into these after realizing SP Upgrade does not transfer K2.
"jUpgrade" is particularly buggy. A look at their forum shows endless challenges, with upgrades simply not working, or getting stuck along the way, content not getting transferred at all and seemingly an endless list of unanswered questions from users whose jUpgrade failed in one way or another. And unfortunately there's zero response from the developers on these questions.
"Import for K2" seems extremely complicated requiring numerous tweaks and changes to CSV files.
"DM K2 XML Exporter" looks promising, however they show how to export but I don't see any explanation as to how to import to the new site. Would you mind giving an explanation as to how this could be used for a rebuilt site?
Thanks in advance.