I should think the 4Bs would work fine for the height speakers.  Of course the 4BPs might be very interesting indeed considering the width of your room.  In case you don't know the height speakers are suppose to be above the fronts or close to it anyway.  There is trade offs with the sub configuration you mentioned.  The 12D does go deeper in frequency but the 2 10Ds should give more sound pressure.  Of course with the 2 10Ds you can adjust the low bass boost to compensate a bit.

Cheers