HEP is correct about steam bending wood, I've bent many a rail during wooden boat restoration. The problem is this material is plywood which may respond differently when wet heat is applied (not in a good way.)
Dry heat must be of sufficient temperature to soften the glue but not melt anything, a difficult prospect.
When I fastened flat ply to a bow cap it eventually formed to the curve, taking off the old 50 year old bow cap it had a permanent bend.
So what you need is a jig, holding it in perfect position after forcing it flat. Then leaving it awhile. Could be done if you are handy.