Ummm interesting, but always going to need a dedicated AH on the battlefield - for the simple fact of hovering, then popping up , fire etc etc...
Also if you look at the Brazilian Air Force - their Mi-35 Hinds were bought to .......replace their Super Tucanos...
IMHO is that COIN slow movers are complement to AH ....
USMC aviation FOB assets in the 80s were the following
AH-1J/T/W
UH-1N
OV-10A/D
CH-46E
CH-53E
AV-8B
For sure the VMO squadrons could always be found with the HMLA / HMM / HMH base such as New River or Camp Pendleton,
cheers