Actually my informal proposal would have the Governors replacing the Senators. As for whether Governors have nothing to do, well its up to the Governor. I've certainly shown that a Governor can be an active position. It would be unlike the US system in that there would officials who have roles in both the governance of both levels of government.
I do not want to give Governors any more power so I am against your plan. Though I could say their could still be 10 senators if you had both the Governor and the Lt. Governor serve and anyway why do we need a bicameral legislature. Our unicameral one is fine and it has worked well.