You cannot transfer points that have already been banked or borrowed. In addition, points transferred to a member can be banked but not borrowed (so your solution is not to transfer your later use year's points to him and have him borrow them to make the reservation).
In your situation, the solution is for him to reserve part of the vacation time at 11 months out using his points, and then at 7 months out you make a separate reservation for the same type of room for the remaining nights using your points, including those you need to borrow. Make sure the two reservations have the same guests listed on them (including the exact same names). After the reservations are completed, contact MS and have it link the two reservations, which will prevent your having to move while there.
Just be aware that there is no certainty any OKW GV's will be available to reserve at 7 months out and thus you may need a back-up plan if you are unable to reserve the needed OKW GV time with your points. If the time you are looking at is between late Sep and marathon weekend in Jan, there is a high risk that you will not be able to book OKW GV time at 7 months out. For the rest of the year, there are often times OKW GVs are open at 7 months out and times when they are not.
Also be aware that if you want to attempt to get the GV at both 11 months and 7 months out, your friend should not reserve an OKW GV in the near Hospitality House booking category. Those GV's are virtually never open at 7 months out.