I finally managed to put together initial version of GPM 3 (for Revolution 3.x).
The current version is still limited on features (not all from GPM v1 is implemented) and may be buggy.
If you’d like to try it, it’s available in the GPM repository in
3.x branch. The only way to install it is through CLI (details in the readme).
With the updated GPM, there are also changes in the Collections
for-3 branch, which you can try and install with the new GPM.