I’ve tried Sitka spruce for inwales on an Old Town OTCA and even with steam could not get them to take the bend at the ends, they broke on me.
Working at the Chicagoland Canoe Base in Chicago back in the day (early '70s for me), sitka spruce was used for the birch bark replica gunnels, the boats with the high up-swept ends. The trick Ralph Frese, the boss, came up with for that problem was to slit with a bandsaw (thinnest kerf we could get) for the length of the bend (and a little more?), then slit each of those also. Three cuts leaves four thin "leaves" that can be bent to the radii needed. For gunnel stock not as wide, fewer slits might be sufficient (just one or two? Maybe? Good luck!). Some careful planning on exactly spacing the kerfs along the gunnel so the curves at each end do end up in the right place to match your specific canoe shear line will need to be done. I can't help you with that. We had charts with everything written out for the various length boats made there.
He had metal jigs that we'd wax, pull the first leaf up against the jig and paint with glue, then follow with the other three in succession, clamping all of them in many places (clamps well waxed) to make sure they stayed until the glue was dry. Each metal jig was 1/4-inch flat stock braced with a stiffener and was over bent somewhat as there was always a bit of spring back. If it doesn't match exactly, a little bit of bending can be done, but not very much. The glue used brown plastic resin glue, which usually matched the color of the wood close enough that it was hard to tell that this cheat method was used to get the wood to form correctly. Epoxy might show more? Try to make sure you get enough glue into the space where the kerfs end so you don't have to fill holes later.
The Indians back in the birch bark days who built canoes would slit for really tight bends (even though they weren't using sitka spruce) and not glue, just lash it all together with spruce roots, as can be seen in
Bark Canoes and Skin Boats of North America.
Just suggestions as to how it can be done successfully. There might be other ways, too. Good luck with it.