Well, they aren't directly synced. But if you would change the code of variants on this site so they would only work with some changed code on this site, then the new, changed versions of the variants won't work on other sites with the old webdip-code anymore. It would be much more difficult to use new vDip-Variants or to update existing vDip-Variants on other platforms if they hadn't the vDip-webdip-code as the variants wouldn't be compatible to other webdip-versions anymore.
And that's the difficulty. Theoretical, these options could be implemented but it's very difficult to do it in a way, the original code isn't changed too much, so official webdip-updates can still be used, and the variant code isn't changed too much, so it doesn't lose its compatibility to other platforms. I have some plans how to achieve this but I haven't checked the scripts for my plan so far. When I will have a finished concept, I probably will post it on the official dev-forum, so it can be discussed by developers over there.
Unfortunately a FoW option might be the most difficult option to implement as it really needs some changes in the variants, but I have already found an approach for this problem, as well.
I cannot promise that this project will be successful, but I could try it, if you would like such options. At the moment, I think, it can be possible. :)