It's been done I believe.. I think it's called the silver bullet? Or is that just a pastel super cinny? I get confused with "specially" named morph combos.
It's a patternless snake that's much lighter in color than a super cinny.
edit: silver bullet is just heterozygous for the pastel gene, not homozygous, so not super pastel, I guess I don't know if the super pastel x super cinny has been done