You could just leave waging war to the military of course............
That's what they did in the Iranian Embassy siege and it seemed to work pretty well in the circumstances. And I understand that the boys who do that work already have their own helicopters.
A "general emergency services aircraft" is another thing, and might well be a good idea. However, as has been discussed here before, the emergency services are directed from different government departments with different budgets. Very little chance of them working together. Just look at the recent trouble over the few remaining "joint" HEMS-police heles.
Would it be possible to combine a civi SAR role with this super ER aircraft? If there truly was a need for a larger hele for some emergency purpose, wouldn't the SAR heles get used for that anyway?
Sounds like a solution looking for a market to me.