You are at min fuel before push back in this scenario. As far as what others find "perfectly acceptable", who cares?
If your variable reserve is used before you get to the CP and you now have insufficient fuel, but the planning department says that's ok, why bother calculating it then? I mean, really, it either means something or it doesn't. (And I am tipping that it does not mean the equal time to ditching point)
And by the way, what an interesting example you cite. Going somewhere?