. . . I decided to wait a bit in the hope Winchester comes out with their Extreme Weather new Model 70 in 375 H&H. . . .
You may be in for a long wait. Had I been in your shoes, I would have taken the specimen you found, put a B&C Medalist on it, and been done with it. In the long run, I think you'd would have ended up $$ ahead AND have the gun to enjoy/shoot now AND not have to wonder when Winchester MIGHT decide to bring out a 375 H&H EW. JMHO.