Filleting Surfaces the Same Way as Filleting curves? Is it Possible?

I am trying to fillet surfaces the same way that I sometimes ask two unrelated, non-connected curves to fillet. The program would have to interpolate the curves (i.e. one might be a part of an arc and one is an interpolated curve). How can I ask the same of surfaces?

Does this work for you?

ExtendSrf on edge of one surface with a large Extension Factor

ExtendSrf on edge of other surface with a large Extension Factor

Repeat ExtendSrf if extended surfaces do not intersect.