I know this is really stretching things with DC's known penny pinching, but what if he decided to hire a new cast for 1795, with the exception of Frid, Smythe, Moltke, & possibly Scott?
Would the audience have accepted the change? I think it's possible they would have warmed up over time.
When the show returned to the present it probably would feel like seeing a show return after the summer break (which in a way it did to me with the same cast anyway).
Joey