I came across this when I did my research earlier but unfortunately couldn't get comfortable it would fit my model (DWS780). It wasn't listed as a compatible model and when looking at the various parts I simply couldn't figure out where they would attach on my setup. That said, the idea of it makes a lot of sense, you'd think an extraction system that takes from behind (ie standard setup), from underneath and the side would be idealActual Dewalt extraction kit. No idea if it will fit yours or how effective they are but it seems to attack it from different ports
Maybe will, looks to be a kind of universal type of set up.
https://www.ebay.co.uk/itm/173777389276?epid=1926268071&hash=item2875f086dc:g:iEUAAOSw6eRcWCBY