Sure thing. I wish I knew about said magic software, but my repeated searching for such a thing leads me to believe it doesn’t (yet) exist. If anyone here can tell me different, I’m all ears!
Not sure if you’ve tried it, but tfm and tdecimate in avisynth do a good job. I recently used them for a 30fps progressive video that should have been 24fps (yes, I mean those exact numbers not 29.997 and 23.976).
Standard or adaptive IVTC didn’t work but tfm and tdecimate restored it to 24fps and to my eyes looks faultless.
Might be worth trying if you haven’t already.
If you would like the exact settings I used for tfm let me know - I might still have them!