Looks like it, except that the hole is probably too narrow. The opening spreads out 2asin(1/3) = ≈38.942°.
A 60° top opening is often used for collars (?) I think. Wait for others to chime in concerning this subject, though.
There is more informed people in this respect than me, but a good starting point could be choosing some known aspheric host which could accommodate the collar, then choosing the collar dimensions to fit. I was going to say the UF-1405, but as I see it its pill design is pretty bad, it would require a completely redesigned pill with super-flat emitter surface as the well known Cometa or Jaxman Z1 (job for kiriba-ru if enough interested people). There's a long zoomie flashlight discussion in Zooming Model List (2018 Updated) Tell us about your newest zoomie!, great place to ask questions about good zoomie hosts for collars inverted :-D reflectors.