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In a way you are ending up with a veneer attached to some ply strips. The risk is when you bend it part of the veneer decides to do all the bending and snaps. You would probably still need to form it around something to stop that happening.
Airhead-
So ‘reverse kerfing’ is a thing according to guitar makers…
I did a a couple of tests with 15mm and 16mm kerf depths - 16mm retains 2 layers of ply, is more willing to conform and snaps at around double the required curve.
I will template the curve (minus air gap and board thickness) and screw into it from the reverse, fill the kerfs with a 2 part filler and see if I can get it to hold its shape. This is below the waterline on a boat in case anyone is wondering why I can’t screw into the steel.
lmamammal
it's phelonic faced birch (Riga Heksa).
The face will be the interior of a cupboard which houses a diesel heater, so it needs to be neat rather than perfect, the outside of the curve will not be visible at all, which why I was curious if I could kerf and bend the 'wrong' way and then fill the gaps,
Worst case scenario I can use a normal bit of ply and coat with epoxy paint.