SVG 2 and w3c tag process

As some of you are aware I've been attempting to add support for 
miter-clip and arcs joins into skia on the way to adding them to Blink's 
SVG stack. That effort has, for the time being, stalled out.

It has been suggested to me that it may be more productive to start down 
Blink's Intent-to-ship process, which I am now considering. Most of that 
is my problem but some parts of the process depend on SVG WG involvement.

It looks like the Blink process requirements include:

 1. WPT tests for the feature(s)
 2. W3C TAG review

A TAG review appears to require, or at least considers highly desirable:

 1. The relevant part of the specification (done)
 2. An "explainer"
 3. WPT Tests
 4. Issues filed against browsers (already existing)

All this amounts to my needing two things: An explainer and acceptance 
of WPT tests.

So:

 1. It appears that "explainers" are normally written by browser
    development teams. I suppose I could open up a github repo and add
    my own explainer, but that seems at least a little weird. Assuming I
    write a brief explainer, is there somewhere within the SVG WG's
    control to host it?
 2. My original plan was to write tests first, but that effort stalled
    out with https://github.com/web-platform-tests/wpt/pull/22791 and
    https://github.com/web-platform-tests/wpt/pull/23565 . I can make
    tests conform to whatever pattern the WG desires but folks on your
    end need to start working with me again.

More generally, I am requesting help from the WG to achieve a small 
automated test suite and TAG review for the two new joins sometime in 
the not-too-distant future.

Thanks,

Skef Iterum