He can also just measure offsets from a string by the foot (or the inch in more complex areas). With a small filet of epoxy down each side of the keel hiding any issues with the joint that would work well to get it done quickly and nicely.
There isn't a chance I'd consider steam bending in this case. For one, the wood is dry, to steam bend it will saturate it and then it woudl have to dry before being sealed.
That will work too, and quite well I might add.
My understanding of moisture introduced during steaming is that it is intercellular, and not intracellular, thus dries much faster than green wood. This is your area of expertise so if I have it wrong then tell me.