If it were me I would go one of two ways. Install a dual or usually triple head condenser and one small unit in each room. The other option would be two of the smallest independent units you can get.
I would lean towards option one and some brands like LG you will end up with a 3 unit condenser but you only have to use 2. Then you get a spare hook up for somewhere else if needed.
I like minisplits but they are not a replacement for traditional forced air systems as they only cool one room. Putting in one system upstairs in your place and leaving the doors open isn't a functional solution as there is no airflow. I don't see a traditional forced air system that would work in your application other than a fur down like apartments have but they are very inefficient noisy and a very difficult install.
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