This is all to very similar to the whole Train Crossing boom gate issue.
With one big difference: The boom gates have a say in this.
Without raising the spectre of an accident, keeping it purely economic, why doesn't the association negotiate an arrangement with AsA that will please all parties? You are always going to get people prepared to work OT -why not get paid at a rate that
1. makes it attractive enough to warrant the personal intrusions/health issues/etc etc.
2. makes it economically unpalatable for AsA to run it's business this way. Surely it's obvious that if it is dearer to run short-staffed and use lots of overtime than employ adequate staff numbers, then AsA will employ the numbers (which will lead to other issues- but that's why they get paid the big bucks in management).
I would think that $3000 per shift would be reasonable, but you could go for more. I mean, it's only for a short time (facilitative arrangement), right? Right? Stop working for less than you are worth.