I see what you are trying to say. The only reason I worry is that were not planning to switch in on strong physical attacks such as that, were looking to switch it in on things like Hippowdons Ice Fang and neutral Physical attacks. Although sure youre decreasing it's chances of being revenge killed effectively, but you're also limiting its ability to switch in on weaker physical mons and dish out damage. Heres an Example:
Hippowdon EQ vs. 0 HP / 0 Def Regice: 40-47%
Hippowdon EQ vs. 252 HP / 0 Def Regice: 33-39%
Now thats enough difference to persuade me to use 252 HP but it depends on personal preference I guess, set comments perhaps? Like I said I see you point, maybe we can get more opinions on this?