Assuming a multi-verse theory and an alternative universe which spacetime is however still 4-dimesnional (i.e. three spatial and one temporal dimensions) but with a maximum speed of causlaity that is $υ>c$ would then the energy to effective rest mass converison equation $E=mυ^2$ still hold?
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Answering what I think is the core of your question: the $c$ in $E = mc^2$ is the speed of causality, not the speed of electromagnetic waves (aka light). In some hypothetical alternate scenario where light did not travel at the maximum possible speed, the equations of relativity would use the maximum speed, not the speed of light. This is because all the logic of relativity follows from having an invariant speed that is the same for all observers. We call it the speed of light because it is and because that's how we do experiments, but being the speed at which light travels is not the point.
And as an aside, multiverse theory is not really a thing outside of science fiction. There is no field of physics that considers alternate universes with different laws of physics. But I think this wasn't the main point of your question.
Javier
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