In a similar vein, it looks like there is a working group for linked web storage at:

https://www.w3.org/groups/wg/lws/

That would likely have some overlap.

If you were to have an accepted w3c proposal and working implementation in local browser forks, you could potentially chat with the browser teams to add the experimental feature first through a flag users would manually have to turn on, and then later potentially it could get integrated.