As much as I'd hate to have to cut up planks that wide, I think I would
rip them into narrower strips and then reglue alternating the annular
rings. Of course you might need to revise your bench plan or get
another planks due to the wood lost in sawdust from ripping.

Seems there's little point in going to the trouble of building the
bench only to have the top go nuts on you. Ideally you would make the
top from QS oak to reduce the movement but I know how dear QS oak is.

Good luck.

Dave