The 200 NM RADIUS is the killer?
Upgrade your current E model!
Of course you would already have the 5 cell fuel system?
Mod. 109-0823-22 Increase Internal Gross Weight to 3000 kg (6614 lbs)
It's mainly gear mods as the aircraft is certified to this weight with External Loads.
Price ~ about a quarter of a buck for the pieces.
1 pilot plus 1 attendant you could probably pick up ~ 2 patients.
Issue is you need an aircraft with an EEW of ~ 1950 kg!