I crush far more bees in the mating surfaces between boxes when I put a hive back together than I crush in the frame rests, but I do see your point. It’s not a bad idea, but I think an inverted V rest made out of wood would be problematic…eventually. The problem is you eventually have to scrape the frames rests to remove some of the built up propolis. I suspect scraping an inverted V rest made of wood would end up ripping up the wood.