The answer is “YES!” The Phonak Cerustop wax guards cited in my quote seem to work fine on my Quattro receivers. Definitively remove and replace with no apparent problems in tightness of fit and grip.
Since the case of the Cerustops says it’s recyclable in plastic category #5, that’s where I’m returning the wax guard removal tool and used wax guard to go to that great recycling bin in the sky.
EDIT_UPDATE One further conundrum arising: on the package of the Cerustops, there is presumably the manufacture date: 2017-08-24. Does anyone know if Cerustops age in a bad way just sitting around? Perhaps that’s why there is such a relatively good deal in purchasing 10 8-pk’s on Amazon of a lot that is already more than a year old. It will take me ~3 years+ to use them all up so the very last will have sat around 4 years after manufacture before being put into use.