Most planes you can trim it out. It'll never be a precision 'Pattern" performer with the warp... the trim needed will change with airspeed.

The stall characteristics will show the arp... it'll drop the wing with the higher incidence first. (the aileron trim won't overcome that)

So... its aqustion of how well the plane needs to perform. If its going to be a heavy, detailed model... you probably should get the warp out. If its going to be a light sport model to buzz the local airfield... It'll fly.
The heavier the plane... the less room for error in the wings. A heavy model with a minor warp can be a beast to fly.

It might be less labor to... buy a new wing core set, and build a second wing. Fixing a warp on a sheeted foam core is a nightmare sometimes... How'd you glue the sheet to the foam?
(that is a foam core isn't it? You mention a cradle in the constrution... the "shucks" of the core?)