My 2 cents worth.
There is actually no such thing as a P2 on a caravan. So be very careful going this way. As many future employers and foreign CAA will not count this time towards your total.
Better in my opinion to get the P1 time on the 206 then go P1 on the Van.
Also If you going to be sitting next to someone in a Van they probably don't have a high total time which can actually do more damage with bad habits to your flying than being by yourself.
BB