I'm reading between the lines, so what I offer might just be disregarded out of hand.
Seems like you're sold on "the system" Festool is selling. It's not the be all, end all and is far from perfect. OF1400 is a solid router in an SUV sort of way, but it has some drawbacks in certain areas. You've stumbled on one already. Second, Its integrated dust collection isn't really an advantage when mounted upside down in a table. The majority of dust will be captured by the fence shroud and the 26 won't really support a large collection point there and a smaller underneath at the same time. You should prob. read the 1400 vs. 1010 thread that recently took place here.
Lots of routers incld. your 1617 have dust shrouds that put them in close company with festool's offerings. So, if at the source dust capture is what's driving you - there are plenty of options that can hook up to your ct26. RA1173at will do you right for the 1617.
There's a school of thought that a single SUV type router is bad investment because you'll eventually end up with multiple routers for specific tasks. Best to get on that's tailored to meet the need at hand rather than a compromise. I'm an emeritus of this school. If you have a table , get a motor for that and leave it there. If you need a small trim router for cutting laminate or putting a roundover on miles of edges - get a small comfortable handheld. Hogging out mortises or making countertop cutouts ? A big 3hp that's very stable is going to be the ticket. Of course the 1617 and 1400 will handle all the tasks I've mentioned - with varying degrees of sanctification. Many a router or kit have been sold with the thinking that "I'll get one good router and be done with it " only to later realize that just isn't going to work out.