How about a sort of sociocratic decision?
Everyone nominates some people, and as a group, discuss the reasons for nomination, the nominations themselves, etc;
Then the discussion leader puts forward a list of good candidates after the discussions. Once those candidates have been put forward to the group, if there are no substantiated objections then that will be the jury.
If there are reasonable objections made to certain nominees, then the process of discussion and substantiation are, for those nominations, brought up again, until there are no paramount objections.
A system of informed consent like this basically means that there will be no-one on the jury that definitely shouldn't be there, and that everyone on the jury will have to have been nominated, gone through a group screening process, and have had their case argued for sucessfully.