<< I don't quite understand the first point you made but it seems you were offering a way to make the fillet work somehow?
Fillet admissible : fillet maxi that Moi can do with a perimeter path or curves selection


<< As for the animated gif file you basically cut the model in half and had a higher fillet on the right object using variable fillet?
Yes absolutly


<< But you can't make the entire object with that same larger fillet?
Yes absolutly : Till now Moi's Fillet don't manage that (i tested with Onshape, DesignSparkMechanical, Fusion 360...it's the same)

And if you don't make this trick (maybe other existing) you can't make any "bigger" fillet on your object, only the admissible "maxi" so above 0.5
With the trick maybe 3 on some parts... i have not more the original object...