I got you, but I suppose this list is only for grafik-tablets🤔
Who has to develop a feature in a foss project? Those who want something in that software. I suggested that you take up the task, as you are already familiar with the current changes and how the sonarpen works.
And don’t misunderstand: Sonarpen is an AMAZING product. The idea itself is genius and that there IS krita support is mind-blowing. 
So many more new artists can take up a sonarpen and start their journey to become an artist. Well, if their tablets have enough performance, at least.
So you have my gratitude for developing the sonarpen support.
Here is a list from this forum. A community curated list of working tablets with krita!