Thanks for the kind words! While a lot of the API in Two.js is inspired (and continues to reference Three.js), it's unlikely something like this will land in the repository any time soon. I think a plugin architecture makes a lot of sense for this type of request in Two.js and believe it would involve quite a lot of modules that don't currently exist (like projecting points into 2D space, geometry, materials).

I understand for this issue you're not interested in other libraries, but I think another interesting idea in this realm is being able to pass the WebGL context from one library to another as posed in this issue. Also, it is old, I have provided an example to build 3D extruded geometry in Three.js using Two.js here.

Lastly, I have used both Two.js + Three.js to great effect for many projects. Most notably the interactive VR music video What You Don't Know. Here I dynamically make many textures (primarily for the in world text, but could be used for any kind of texture) in Two.js and then upload them to Three.js to place them in space. Also, in Tether the entire Two.js scene is uploaded to a Three.js texture and then GLSL post processing effects are added on top. This style of working in 2D and then adding some GLSL effects on top is quite common for Pixi.js.

Hope this helps at least expand the discussion a bit and gives references for anyone else looking for these types of features in lieu of a Two.js plugin for 3D.