That may work.
However, it depends on how the federal courts will interpret the supremacy clause.
If the fed courts rule the fed standard overrules the state, that would end the state's higher standard.
No, you are wrong. The SC has held that state constitutions may have stricter provisions than those allowed by the federal constitution.
For example, California can have stricter environmental standards than those of the federal EPA. The supremacy clause does not trump.