Hi Mark,
I don't have any experience with this specific case myself, but I did handle comparable scenarios via SVN before. You might want to have a look at the link below (or a comparable article for SmartSVN). As Studio Pro is still open when you try to revert the commit, I assume that it is having a hard time reverting the version upgrade. I did use this to promote different revisions as main/trunk, so, therefore, I feel like this could work for you as well.
https://tortoisesvn.net/docs/release/TortoiseSVN_en/tsvn-howto-rollback.html
Personally, I would also be interested to know if this operation will actually break Studio or Sprintr. I don't think so, but it could be helpful to ask this to Mendix support directly.
In Studio Pro you can go to:
Version control > Reverse merge changes > Select the revision that you want to undo