If the organisation is union friendly and a lot of the workers are already union members then chances are the unions won't pay for a lawyer. Got that low-down from one very popular law firm in Australia whose "funding" for these kinds of cases is paid for entirely by unions i.e. they don't bite the hand that feeds them.
Re the farcical meeting, it appears that whoever is going for that bonus for your head has tripped over him/herself, so just to add a bit of formality and record of the event request a copy of the meeting minutes from whomever chaired it.
It looks like they don't have much to go on and are trying to force you to make an admission. Just be very careful what you say to them and be particularly attentive to not saying anything that can be deliberately taken out of context by them.
Cowards the lot of them.