For what it's worth, the last time I had a yew stave with that much deflex, no matter how much steam and dry heat bending I did, the deflex came back every time. It was the last bow I posted actually.
I don't know how differently baccata behaves under heat to brevifola though, so US yew might respond better. I also find removing long even deflex a pig compared to concentrated areas, but I'm no expert! That stave shouts r/d to me. I reckon you'd be happier at the end, rather than struggling to straighten and being disappointed.
Either way, g'luck!