IMHO in that sort of scenario the designer should have his VPs cater for this.....Huge points on 'Blue' units, every man lost is a calamity.
It's easy enough in principle, but balancing it is harder than a more conventional battle.....My usual rule of thumb is 'Asymmetrical Warfare Requires Asymmetrical VPs', with many, many more available to Red, simply because their chances of actually getting them are so ridiculously low.