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the obvious QR mount of choice is this one:
https://www.sjscycles.co.uk/luggage/carradice-original-bagman-quick-release-support-expedition/
which people have been talking about here and in the carradice saddlebag thread. I have used one with a smaller saddle bag for commuting (without the steel supporty bit) and found it great. I think this massive bag would need the wire support though unless you had acres of clearance between saddle and rear wheel.
Does that need those saddle clip things or can it be used with a QR bag mount of some sort?