"Edit the UV2 file ???"

Yes; been there, done that!

Not exactly a user-friendly solution, though! :-(

How can they make a product where the order of files is central to the operation, and yet provide no means to adjust that order!?
Doh!!!

May be I should publish Andy Neil's Guide to Hacking a UV2 File on my user page?

Another case of NEIDE (Not Entirely Integrated Development Environment!)