I can tackle the 3rd ????
I have 4 seprate contracts with two Use years. I dont think you would have any trouble getting a March use year to match your BWV UY. But I am not sure if you want to know the benifits of having two UY.
The bulk of our points have a December UY. BUt we just added on a 270 BWV add with a August UY.
Because of that we have two membership numbers. Not a real biggy.... (3 contracts under one membership number, only BWV has its own, but if we were to buy another Aug UY contract (HA NOT GOING TO HAPPEN!) It would be under BWV memebership number.... MAYBE. Anyone confirm?
Anyway I just booked a Concirege Collection ressie using my OKW points and my new BWV points with no problem. Even transfered some points from BWV contract to the OKW contract without penality, to complete a night. If we have to cancel the points would be put back in their respective accounts (with the transfered points staying transfered of course)
We also try to plan out which UY suits the time of year we want to travel. Another plus for it
Dont know if this is the kinda of info you need..... but I thought I would toss it out there.