I just acquired a large (9' x 14" wide x 2.25" thick) white oak slab from a local sawmill destined for my inlaw's mantle. I hadn't noticed before I dragged it home that it's got a pretty severe twist (about 2" at the ends). It's mostly in the last foot or so of the board I can probably shorten it up to close to final length and get some out this way. I can also loose about a .25" on each side to untwist a bit, but I'm still looking at a pretty big effort to true it and keep 8'.

I've been looking at how to take it out without loosing too much thickness. The best advice seems to be "buy another slab" but I'm not sure that's viable in this case.

The best solution seems to be:
1) rip on bandsaw, (which is gonna be a challenge with a piece this big)
2) then true up the pieces,
3) then glue back together
4) then retrue.

Does that work for twist?
Most of the (rip and rejoin) technique seems to be focused on cup, not twist. The "kerf the back and press out" method probably wont work since it's a thick thick piece.

I should also mention that my main jointer is 2.5" wide as it's a 607. I do have a power planer.