The future of content filtering (declarativeNetRequest, Manifest v3, and beyond)

This is both an FYI and some follow-on questions.

The FYI -- For those who haven't yet heard, Google is planning a severe reduction in extension capability for blockers and other content filters. Their current draft of changes includes deprecating the webRequest API and replacing it with declarativeNetRequest. This will only permit a fixed number of purely declaritive rules in a single json list. Moreover, the browser will have final say on what requests get blocked or redirected.

For more info, see this uBlock Origin thread. It has all of the relevant links.

I have two follow-on questions:

1. Is there any interest from the developers here to integrate a filtering engine? I realize this is a big request, but the new API will eliminate the possibility of uBlock Origin, uMatrix, and other robust extensions. Since this project recommends those on the wiki, it will impact this project and its users. My idea is to modify Brave's engine, which is already integrated but has only AdBlock Plus level functionality.

2. If not, can you recommend how to undertake such an effort? I have experience working with large C++ codebases, but nothing browser-related. Any tips, gotchas, etc. would be appreciated.