Are you quite sure, DC? Scotland already has a (somewhat) separare set of laws and devolution in Holyrood. Are you saying one of your optuons is to scrap all that, to have all rule from Westminster.
Demo max (I believe that is the jargon) would increase the powers of Holyrood, but is a difference of degree, not a completely different system.

I see it as a pragmatic approach as a stepping stone to full independence if that is wanted.