You could probably jerryrig "seamless synching" with some initial effort simply using VimWiki and git, of course the Android portion is going to require the mos

You could probably jerryrig "seamless synching" with some initial effort simply using VimWiki and git, of course the Android portion is going to require the most significant setup, but I don't see a reason why it wouldn't be doable (but then I'm not too familiar with Androids filesystem and I'm assuming it works at least marginally like the Linux filesystem)