also, don't worry about "what the grain is doing" it'll be fine- just leave the bark on the back for now.
and drying time- it's hard to say... a year would be plenty, if split in half, 6 months might do it.
That's why I like vine maple- dries faster with little checking. i don't even seal the ends.
so, grab yer saw, go get a few more OS and a VM or two. dry the vm quick and the os slow.
Ideally, peel the vm bark immediately , but don't seal the ends. lash the vm to a 2x4 and dry in an unheated garage 2 weeks. then move inside (cool place) 3 weeks, then put it somewhere warmer and drier for 2 weeks and it should be ready. this is for a sapling stave- try for one like your OS. be very careful of the back- do not cut or ding the outer growth ring. I use a wood or bone knife to get the bark off.