To go back to the original question, there would be little point in trying to set up an alternative union. UCDSU is actually structurally more democratic than the Oireachtas. There are provisions on how class can hold meetings and mandate the reps to propose and vote in favour of motions.
The problem is that the SU is totally irrelevant to most people, they see no difference from year to year, couldn't give a toss who wins elections, and never get involved in anything the union does.
Anything Redmond or Exec support can be overturned by the majority of council. It's likely that a motion will be thrown into council and the policy on the health charges will overturned.