Ok, the app is public now.
You can find it here
It does all that is promised, and a bit more.
Aimed at you having to do as little work as possible, but I can imagine it will be a HUGE timesaver in post.
Now, I've done my best (to my horror I now see i've been working a month on it.) to accommodate all needs, but I'm an editor and coder, not a sound guy.
So, there probably are more improvements to make. Don't by shy with comments!
Oh, fair warning:
If you run the demo:
Offloading will do no harm to your files.
Altering the metadata / setting timestamps WILL! (It will add 2 seconds of silence every 25 seconds.)