I am in a similar situation. I had a split part staff loan and part tracker and the staff loan was mass moved in January 2009 to variable rate . The option to move to tracker was not given even though I had part of the mortgage on tracker. I did not get 1615 comp. my case is now with the ombudsman and they are waiting for response from aib.
I'm also in the same situation where the part of my mortgage which was on the 3% rate was moved to the variable rate without an option of a tracker at the time. At outset, part of our mortgage was put onto the staff rate of 3% (wasn't optional). I had contacted staff business back in 2016 but I was told that I should not have been offered the tracker rate. I wasn't aware of Clause 3.2 until yesterday but checked my documentation last night and I have this clause. My wife left employment with AIB a number of years ago so we didn't know if staff were involved with the union on this. Also we weren't in the group who were offered €1,615. Will be watching this unfold with interest!