Could Tony Romo be involved in potential Cousins deal?

The Redskins, Cowboys and 49ers are flirting with the idea of an unprecedented three-team quarterback blockbuster.

The three organizations could soon discuss a trade that would send Kirk Cousins to San Francisco, Tony Romo to Washington and draft-pick compensation (including the No. 2 overall pick in April’s draft) to Dallas, NFL Network Insider Ian Rapoport reported Friday, via sources informed of the potential talks.

To be clear, the proposed swap is in a stage so preliminary that serious negotiations have yet to take place — and might never reach fruition.

The Redskins are in a quarterback pickle after handing Kirk Cousins unheard-of leverage by way of a second consecutive franchise tag. 49ers coach Kyle Shanahan is an avowed Cousins booster. After mentoring Cousins for two years in Washington, Shanahan attempted to trade for the former Michigan State star after landing the Browns offensive…