Page 18 of the manual says that all accessories are powered from the lower left shaft, not the draw bar, but doesn't say how to address the height dependency.
Re the coupler, note that hub that goes on the headstock will have four (4) grooves, this will mate with the end of the coupler that has the spring. the two loose hubs in the video go on the accessory (bandsaw) and have five (5) grooves.
Does the hub that is mounted on the lower left coupler have a 5/8" hole and a setscrew?
You could try mounting the bandsaw on the right end where the tailstock normally goes, and put the drive hub on the spindle in place of the saw arbor. Reverse the motor rotation so the blade turns in the correct direction.
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,