When I briefly tried I was unable to get what I needed out of the regressor from the same data, and even then I’d need to recode the hotest output finder (but I didn’t try that hard), so yes what I have in my custom version outputs two further values (I forget what they both are) that are designed to give some indication of confidence. I think those values would be derivable from the regressor but it was easier to add them to the output for what I needed.
I don’t use them to create interpolations between categories and I’d expect them to very poor at indicating that (as @rodrigo.constanzo has found above. What I use them for is to allow the classifier to have no output (as in - the match is not confident enough to be responded to).