I agree, the axle mounted park brakes are faaaaaar better.
FJ60/62 rear axle housings are easy to find (if the width works for you), or you can find a late model FJ40 axle housing, it will bolt right to your springs, have the correct width and the better park brake setups at the rear drum.
I too run 6x axles F/R under my FJ40, I love the stance.
Yup. 7x series axles work really good as well, especially the rear FF's.