Painting directly on the models?

I’m having a hard time trying to develop seamless camouflage patterns for my plane user skins.

I looked into the possibility of exporting a 3D model into 3D software so I can paint directly on it, but it all seems insanely complicated, like using 3rd party ripping tools, then manually adjusting everything…lots of untested 3rd party plugins from years ago, not maintained etc…

It’s really glaring how much more complicated this is than “regular” skining that gaijin facilitates.

Is there a better way to do this? Has anyone managed to find a simple sane way to paint directly onto the model? Thanks in advance :)