msycamore said:

... I'm not so fond of the slight fuzziness it introduces going by that sample pic but it may be a worthy tradeoff I guess.

DeHalo_alpha seems to be the best they've got. I looked around for updates or other filters but none to be found. Even tried one that forced me to add sub-filter after sub-filter to eliminate successive "function not found" errors but it proved to be only fair at best.

So, I tried twiddling the parameters and discovered, for this application, the radius was too high. For the optimum setting, "5.0" is it -- lower and it doesn't do enough; higher and the "ringing" artifact starts to show.

rx=9.0, ry=9.0 rx=5.0, ry=5.0

As it's less drastic, the new correction isn't as overall soft, while doing a slightly better job reducing the leftover color fringing (no "added ringing" this time):

original DeHalo @ 9.0 DeHalo @ 5.0

I'll update the previously posted Avisynth script parameters from "9.0" to "5.0" to keep the code correct.