Dont know if this can help you actually, but if you are creating the players on server, using local procedures like proc_local it should work with all clients..

Just one thing that you may check, if you didnt allready: before using proc_local dont forget do put a sleep(1);, otherwise proc_local dont update the info on clients, it needs to wait after entity creation on server, but probably you allready saw that.

Hope it helps.