This is a very different situation to 2014. We negotiated and accepted a settlement with UEFA that wasn't particularly onerous. Yes, we could have challenged the way they dealt with the whole matter and their moving of the goalposts, but as Khaldoon said, we took the pinch and moved on. I suspect that if we'd known the way things would turn out, we'd have played hardball but we shrugged our shoulders and moved on.
But it's not a case of "accepting" anything this time. If any sanction is deemed to be appropriate the panel will decide that without reference to what we might or might not "accept". Of course we can appeal any sanction so in that sense we won't accept it.