I think some of the best quick release systems available on the market are used for suppressors or blast deflectors. If someone could take one of these many available methods and fit it to a saber we could potentially have a very solid and effective system.
I own many suppressors from numerous companies and while a good idea they all are not what I would call quick release. Probably the fastest is my AAC suppressors which requires a quarter turn but is locked in place with a small "lever". One must hold the lever up with a thumb while turning the suppressor - this is not as easy as it sounds and cannot be done on the run. Suppressors are made to be locked in place and QD means you do not have to unscrew it 4 revolutions like the older ones do. Even my bayonet tri-lug for my suppressed HK rifles require a flange to be lifted (which fits tightly) even though it pulls straight off - again not something you can do while spinning or dueling.
The previous idea of a bayonet fixture or spring load is probably more feasible as one could grip, push and turn easily.