I believe there should be an opt in system for receiving the monthly updates before the usual wait period (that is, receive them immediately). This should also bypass carrier restrictions as have been claimed as the reason for many not receiving the updates. By using an opt in system the user takes the responsibility for any incompatibilities, but I doubt there would be any, and also allows them to report any issues that could potentially be resolved before the actual official release.
I know a lot of users would be keen for something like this. Many users are unhappy with the show release, or even months of no release, of updates for their devices. The end result is they may just but another brand. This will also help keep these users in the Nokia Brand and potentially gain new users since there won't be the negativity of a slow release cycle. Such a system should be available across all phones. Any beta programmes such as Android Pie can simply be another option with the opt in system when it becomes available.