Executive fiat is not representation. The Caesars succeeded in eliminating the Roman Republic Senate in the same manner you prescribe... all by popular fiats.
Aren’t we speaking of a Judicial finding here? Executive fiat in this Republic only applies to controls over the executive branch responsibilities.
Caesar eliminated the Republic by refusing to lay down the control over his ARMY which he brought back into Italy from Gaul. He and his successors ruled THROUGH the Senate no by executive fiat in any case. They never eliminated the Senate just its power.
Where did I “prescribe” anything? I only described.