What I am saying is that it may be able to solve two problems with a simple attachment.
Not all track saw cuts are on an MFT. I use mine for cutting straight cuts at or near the edge, sometimes also cutting slight tapers, where part of the cut leaves the blade exposed (or nearly so)
In a case like this, the dust extraction is not so great. A simple piece that could be inserted into the opening of your device, reaching closer to the point where the blade exits the wood, might help with this? Then the whole thing would be pushed by the saw. It wouldn't be cumbersome to the saw, because it's not attached to it. Being held to the track by the upward facing groove would keep it from falling off of the track as it moves, since the hose would apply some drag against it, trying to pull it off.