“it is openly stated in many places that a real Jewish state must be a Torah-based monarchy”
That is not a unanimous opinion. See Abarbanel for a contrary pov, one that is hard to dispute.
“for the most part the of an elected government was unknown until at least the 1600’s in England.”
Actually a few places — including England — had had elected parliaments before then. Many Italian city-states were Republics. And Switzerland has been a Republic for 700 years.