Sub D challenge 3!

[AlanMattano (Soaring Stars lab)]

I try to push Rhino developers in this direction as much as I can.
Towards degree manipulation.
There is a specific thread for this talk:

[WISH] SubD second degree or changing degree of a SubD?

Hello, I wish a second-degree SubD (with a radius 0.707 weight point) G0 or G1, not G2 [SubD secondDegree] So I can make a spherical sphere and cylindrical tubs. In my design, I use only a second-degree curve. If Rhino builds such a tool will be the first and only one. The interior of every smooth edge is G1. Every quad face is G1 Thx,