I'm not sure what you're proposing, but my own preference (as a California voter) would be for initiative constitutional amendments to require a 60% supermajori

I'm not sure what you're proposing, but my own preference (as a California voter) would be for initiative constitutional amendments to require a 60% supermajority. Initiative statutes, which can be modified after passage by the legislature, I'm still fine with passing on a bare majority.