By marketing I mean the framing of the competition, I guess the branding. Make it a spectacle and highlights the local nature of the teams, with pros and amatuers/semi-pros playing against eachother. I'm just spitballing here, I obvsly dont have a fully thought out plan. And as I said before financially and logistically it makes more sense just to have Super Rugby "A" teams.
However, for a dynamic competition, which will bring in fans and have sense of tribalism and such, I think using the clubs is the correct way to go. I still believe a competition using ready made club identities would draw more fan engagement, then using the same old super rugby branding.