No way they will be able to plan, make, and test any interesting instruments if they start now. With the proposed time line it is guaranteed to be a pure put trash on Mars mission.
(Would be a shame if contemporary car brand rivalry was a bigger hindrance to cooperation in space exploration than cold war rivalry was in the days of the Apollo/Soyuz docking)
And yeah, as aerovistae said, there may be other organizations like NASA who have instruments already ready or nearly ready to go.
Nor will you find something like a "planetary protection engineer" among their open positions.