I had a setup like that on my shop vacuum, not for the dust collection but vacuuming the floor and it worked great, Steve I wonder if you could jury rig a Dust Deputy into your system.
That looks like an nice set up, be anxious to know how it really works and how long it would last. If it is good, it would be worth the price although I will want to figure out a better under the table setup for dust collection than the Ex has.