Flow: Honestly, it's time consuming enough to try and test just my changes... For the moment, perhaps people who have successfully upgraded can chime in with a remark about it working so others will have more confidence.
On the other hand, I have been making slow, but steady progress on my own script. First version is still a few weeks away but it will be similar to nxTools to start out with. The reason I mention that, is because it will eventually provide features way cooler than Warchive so perhaps that will solve your problem
Anyone with any suggestions for things you want in a site script should chime in now...