JT, I am not sure what you mean exactly, but based on the core of thread, the regulations doesn't only cover the requirements for a driftdown from cruise.
I mean, for example, in the case of Engine Failure at take off and need to divert to take off alternate because of weather, the weight at the end of take off flight path, shouldn't be more than so that the net path (in this case a climb path = 1.1% less than gross path for 2 engine airplane) sould be clearing the terrain (e.g mountain, if there is) on the planned track to take off alternate.
We are not (at least me) facing all these requirements because Take off performance Limied weight is usually the most limiting weight of all these phases, at least at the places where I fly.