Hi, I thought I might drop a few cents to this conversation as well 
I’m part of the team at meissa.de which currently works on furthering the federation effort for forgejo. A few weeks ago the federated-star feature was merged (Link to PR). We’re currently planning work for the un-star feature.
I also read the agreement on the fund and found some overlap between finishing the federated-star feature and the work plan. Maybe we could have a chat and work out if we can fit some of our effort into that plan.