OK, so it's easy to say if you're in a job. But if people accept this, it will have an effect on all terms and conditions for many jobs in the future. Sell out now for a bit of easy money and accept that you will earn less in the future. But I would say that if you are good enough to get throught the BA recruitment bullsh!t (which I'm assuming there is some of with this job) you are good enough to get a better job elsewhere.
And don't underestimate an IFALPA ban. There are a lot of companies out there who respect them and you could make yourself unemployable, not to mention a pariah.