I have no idea if there is something already in place or not. If there isn't then I think their hard work and dedication as well as their contributions to the player base as a whole deserve a reward of their choosing or of gs's choice. Myself, I would give them a trident if they don't already have one.

It's easier to make a PCC mission than it is to build a trident. The reward if anything should be some sort of skin.

All rewards should be optional, at the discretion of the receiving contributor.

Rewards should not be a trident, or any in game, utilitarian reward.

Rewards could be:

Access to a uniquely painted version of a ship.
A Badge.
credit and recognition on a page on the website.
Free subscription time.