Edit in PlatformIO and Build With Arduino For Unsupported Boards

The MattairTech Xeno Mini with D51 chip has not been added to the supported boards. It’s on Mattair’s roadmap and there’s a PlatformIO feature request for it too. In the meantime, how can I leverage the Arduino IDE core packages for this board with PlatformIO? I really want to be able to edit using PlatformIO (and vis-a-vis VS Code) and then use Arduino to build. This would be fine if it weren’t for the fact that the sketch no longer has a .ino file. What shall I do in the meantime? Thanks!

Have you contacted MattairTech team?

Yes. He has it on his to-do list however I wanted to get a jump start.