Actually, an A-10 can fly (based on specs, no one has allowed it to actually happen) from an LHA/LHD. It just cant land back aboard.
Iirc the USMC used to operate OV-10s from LHA/LHD/LPHs, on one way missions where the Marines had taken an ashore staging area via vertical envelopment.
Same thing can happen with the A-10s. Fly them ashore after the first wave, have them operate, as they’re designed to, from roads or dirt strips using CH -53s to haul in fuel and bullets.
No MEU commander is going to sacrifice 53s or MV-22s for a capability that will probably not be used for routine deployments. Then you have to find space for the support personnel. Makes more sense to put all the support personnel on the C-130 to Rota or Hawaii//Okinawa/Diego Garcia.
Yeah. That ride in the Pacific would suck.