At least one owners' club has sales and spares arms, where machines can be put on the market on consignment.
Certainly the AJS and Matchless club does, and one or two deceased friends' bikes have thus been moved on at correct market prices. Not just bikes of those marques either - there is a wide range, from restored high value, through good running machines, to projects of various sorts.
Certainly an option I have in the back of my mind, as it generates sensible funds for widow(er)s and children, keeps machines in good hands, and also generates a few ££ for the selling organisation. (In the case mentioned, ££ which are ploughed back into the manufacture of new spares, to the considerable advantage of all other members.)
Would possibly solve the dilemma Rex mentions - given that the 'plan' outlined is madness. Were I he Rex, I'd consider it seriously, especially as you say we're talking tasty machinery in that case. Then, fair values can be ascertained for those inheritors who may want one or other and taken into account in the general distribution, and folk can't in all conscience slide into squabbling mode. (Unless the inheritors are donkey sanctuaries, of course, in which case they just get £££.)
The Vincent thing caused a good few club subs to be cancelled as I recall, and led to all sorts of litigation and general unpleasantness. Human nature at its worst.