Insulation is expensive but giving the situation and remedy its probably a good way to go.
One more cost but it keeps the ducts where they are and gets the system up and running fast and more efficiently , with luck the crawl space may well of been insulated already as the ducts were.
He feels his house would need 5 indoor units if he went the mini split route I personally like the idea of using 3 outdoor units say one with a dual indoor unit. This way you turn on a split when its needed and let one or two of them do most the work and have the main room heat pumps thermostat set higher then the bedrooms so those splits come on less. Zone control threw the units themselves.
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