You could also donate some money to the rockbox fund. It will be used to bring developers together (there will be a european and american devcon this summer) and to buy new players for devs.
More and more rockbox devs are buying meizu's now (all 8GB M6SL so far), so when they all arrive the port will get some more attention.
A lot of work that has gone into rockbox was not target specific but benefits all players, including the meizu models in future, that's why I personally think it would be a bit unfair to set up a meizu port specific fund, but you are free to do so of course.
btw, I added a todo to the rockbox wiki so people can track the status of the various parts of the port and see who's working on what:
MeizuM6Port < Main < TWiki
EDIT: this is a nice summary of what people can do to help rockbox in general if they are not programmers:
daniel.haxx.se What Can I do for Rockbox when not Programming?