In general, A3 & OA are amongst the least obstructive airlines for paying mandatory compensation.

However, I imagine we'll need some more detail from you. This doesn't sound like an EC261/2004 issue so far ahead of your flight, when timetable changes would not come into the scope for compensation, and certainly it would be extremely unusual if any airline paid out what might be the maximum compensation for an involuntary denied boarding situation seven weeks ahead of the flight (as in, it never happens until the day when the number of people checked in is clearer).