Can it be done? It looks like the sliders could be connected to the track-end dropouts, but I've never held the two of them at the same time to compare. I've been contemplating converting a track-end bike to handle disc brakes, and adding sliding dropouts is one way I've come up with.
The only real issue I foresee is that you would reduce your rear spacing from 135 mm to maybe 130 mm.
I'm assuming it can't be done cause I can't find anyone that's done it, but I thought I throw it out there for comment.