The really is no reason why you BigD or you LoudMusic couldn't use drawbars in these situations. In fact, when I owned a lot of di-e-sels in the past, any powered loco that had a dummy in the consist, also had drawbars between the powered and the dummy units.
LoudMusic, (wish you guys would put some names in there), The only problem I can see with what you want to do is in transporting the units to and from the club. Handling 4 locos connected by drawbars can be very awkward. I would drawbar the first two locos together, the A-B, coupler on the end of the B. The on the second set, another coupler on the end of the B, with a drawbar connecting it to the last A.
This makes them easier to handle during transport, and only one "MU" cable plug would be needed.