I have long published my own exporter, but blender’s rejection of game properties as a material concept put an end to this.
However, I decided to start with a clean slate, for this I came to a safe concept, editing the main properties of the game has been moved to Panda.
However, while I was looking for the possibility of creating my own classes in Panda, I came to the conclusion that it is not so difficult to implement direct loading .blend files. This will greatly speed up the exchange between the editor and the engine at the development stage. Therefore, this concept is already outdated.