Color fonts really hasn't converged into a standard, and their adoption is slow. OpenType-SVG was accepted 10 years ago, and it was implemented into FreeType only one year ago --- it hasn't even trickled down to most Linux distros (nor is it usable on Windows). I don't see COLRv1 in Win/Mac/Linux until 2026 at the earliest.
But I did try to make it into COLRv1 (as well as COLR/CPAL). The only tools that build COLRv1 right now are the tools from the Google Fonts team; I remember them stalling for hours before saying completion, yet the output was broken (I can't remember how it was broken).
I personally would love to see a COLR/CPAL version, and have some idea on how that could happen. But I probably should be working on some revenue-generating product instead ;)
I notice you're using OpenType-SVG here; have you investigated whether it would be possible to implement this using COLRv1 (which would potentially result in a lighter-weight font, I suspect, and eventually wider support)? Or are there technical limitations in COLRv1 that make it impossible?