Your union reps could do with all the help they can get. Scanning the master rosters is a very time consuming task...and the reps do the best between balancing flying (they are all full time crew), answering phone calls from members, etc.
Fighting for a union rep to check the rosters??...how about crew actually putting their hands up to assist the current reps?
For what it's worth of late, the union reps continually have their hands full, from dealing with the EBA negotiations, disciplinaries, and so on.