re: GRR-Ripper style push block with retracting stop

Touché RL... however there may be tracksaw track owners that have relined their tracks (not becessarily the Fe$tool brand)... with some left over, wondering where they can spend the "big change", rather than in the scrap bin...

Alternatively, as mentioned, I have the originals, but if I didn't, I'd have used the "change" from my MFT style benchtop,

Furtunately I have more in my scrap bin than just timber.
 
Would be a costly exercise if you didn't have the scraps and it didn't work, however, from my tracksaw/benchtop use, it sure seems like a likely candidate.

Rubber strips and/or neoprene (stick on) may also work...