I am a PCS member and rep.
It is a democratic union where any member can put something forward, and if it is endorsed at a branch meeting and doesn't break any rules it can go forward to conference. Personally, I think this is a good thing- motions put forward in previous years came from GC women when 'no debate' was the TRA line. Now we get the opposite.
Most motions will not be considered by conference, they will time out. If it does pass, (and it may well pass if it comes to a vote) it will probably disappear into a myriad of committees for consideration, and no ballot will ever take place.
If it is put to a ballot I would say very few members would vote to take action on this, and many reps wouldn't bother to campaign to encourage them to do so.
I don't know if that is helpful info or not, but my view is this is a variation on the annual Daily Mail theme of 'let's see which motion put forward to conference this year seems most rage inducing, and then mislead people into thinking all civil servants support it.'