In addition to that .....
Everything I have read discourages running more than one DC on a given system. That would include shop vac or vortex vac as well, I assume. The reasoning is that one will overpower the other and cause it to spin faster than the recommended RPMs. I don't think home vacuums are a good idea for dust collection in a wood shop. The quantity of dust or chips from machines will quickly overwhelm their small capacity.
Only experimentation will reveal whether or not it will work as I doubt if anyone has come up with the solution you propose and will have any solid results.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)