We are replacing a RF Britax Blvd following a car accident. DS just turned 3 within the last few weeks and weighs about 33 lb. The car is a 2013 Volvo S60. I wasn't planning to turn him FF yet, but I am not sure about the cost of buying a new convertible seat for this car, since DS does not ride in it very frequently and will be FF within the next 12 months. I am debating between moving the primary seat (Britax Advocate) from our minivan when necessary, using the Cosco Scenera that we have for air travel in the Volvo, getting another convertible, or just getting a FF seat for the Volvo. I would appreciate advice. Thanks!