Just to point out, even a P2 implementation is still very useful! P3 is necessarily more complex than P2, but P2 also contains very useful features that are worth implementing. Most language toolchains are centered around p2 today and that will take a while to change.

Also, there is an adapter for automatically taking p1 components to p2, and a p2 to p3 adapter may exist in time, if desire is great enough! IIRC it doesn't exist right now.