Are you looking for people who worked on WebKit in the past?
I really hope you refactored WebKit's Bridge, because it allowed a lot of exploits in the past, and was neglected upstream by Apple.
When I started my RetroKit fork I was aiming to reduce that attack surface while offering farbled apis based on other browser behaviors and their profiles. [1]
My fork has been neglected a bit due to lack of time, as I'm currently still busy with other APT related things before I can get back to it.
Would love to chat whether your plan is to open source your WebKit fork, maybe there's some overlap and we can work together on it?
(I currently hope that ladybird will be getting into a more forkable and modular state, because servo passed by that goal a long time ago).