In my 16’ Bell, there was a thwart immediately behind the bow seat which you won’t have to deal with. I had to remove it so I can paddle it backwards and don’t notice any added flex. I occasionally remove the front seat for more dog room, but it is so infrequent that I do as Alsg describes. In my Northstar the seat is permanently removed and stored in the basement. It looks like you won’t have any support between the carry handle thwart and yoke with the seat removed, so if it feels like it needs stiffened, you could always cut one to size and install in a pair of holes used by the seat. Both my Prospector and Northstar have a intermediate thwart between the yoke and carry handle. Enjoy the new boat!
Barry