A Cyclone with the CT-Sys... I think you are missing the target market of the CT-Sys.
Well, not really. The discussion was about expanding a CT-SYS target market. I have seen Peter Parfit use one and I know how (little) dust gets through the cyclone.
Going onsite with a CT-SYS + CT-VA + cart combo makes a lot of sense.
You can use the CT-SYS
2 as a primary vac with the cyclone (not really bigger than a normal CT) AND be able to disconnect it for that special work on a ladder here and there AND get excellent economy out of it.
For an install job, you would leave the CT-VA at home and put systainers on the stack instead.
For a quickie, you would take just the CT-SYS
2 with a short hose, no accessories.
Having the extraction port on the side is all that would be needed and it would not impact/affect the current use cases. It would just add more scenarios.