Okay, tell me what you think about this.
Remember the episode of TNG with spock acting as an ambassador to romulas? Yes? Good!
Okay, now, take into account that we was attempting to bring peace talks between vulcan and romulas.
Now suppose that no matter how damned hard he tried, it didnt work.
Alright, so up comes this Reman resistance
Spock and his followers see this as a good oppurtunity to help overthrow the romulan government in order to allow a more beneficial one.
Okay, so what does spock do?
Well so besides having the backing of some romulan admirals, Shinzon also gains backing of some of the vulcan people, but at the behest of spock, they keep it under wraps.
It would also explain the Photon Torpedo Launchers on the Scimitar (as apposed to Plasma Torpedoes)
So i have to ask, Was the Scimitar really a pure Reman design, or was it a blending of Vulcan, Reman, and Romulan (taking into accound that Reman and Romulan would actually be very closely related)