harmful mosquitoes could be genetically engineered to ignore blood meals and instead focus on plant nectar only
Yep...that's bigger solution for release from dangerous mosquitoes. But I don't know it will confirmly be or not. Peoples don't prefer to see any modules mosquitoes. But you know some of mosquitoes live using flower honey. Scientists need to grow much like those once. Immediately need to change generation.
Nobody likes a cloud of mosquitoes, but if they are not biting anyone and may be serving some useful purpose, they'd be no worse than gnats. Most people do not live close enough to an agricultural field like this one to get mosquitoes traveling to them from this cloud anyway.