I will try and keep a project going to fleet marks for people to dump extra marks so fleet credits can be earned.
Word of advice, there's a reason why we've never queued "Unload Surplus Fleet Marks". It gives a really crappy amount of Fleet Credits so you end up wasting a lot of Fleet Marks for reduced rewards. Instead, please constantly run "Coordinate Colonization Efforts" the project if you want to dump fleet marks.