Well, you could then use the T track to hold adjustable baskets for the small stuff.
Actually I fond those T track segments to be rather flimsy and being embedded, I think you'll actually be worse off versus just leaving things as-is.
With reduced back-presence in mind I think some 1/8" thick x 1/2" steel angle would give you a much stiffer 0-clearance option (wide side on the surface, adjacent edge in a 1/8" kerf in the slab.
I have some 3/4" wide x 3/8" thick steel miter bar I'm saving for TS jigs that would be far stiffer that the T track if you do go that route.