unusual setup for sure. You need to buy someones product and live with what they make as a kit/system.
the system you're asking for needs to be able to manage oil and refrigerant migration, be able to pump down the indoor units that are not active, and so on. these systems exist, usually in hotels/large buildings.
if you want to go this route, I think you'd be better off with one of those self-contained chilled water systems. then you just plumb pipes to each unit and fill it up, and the outdoor unit modulates to provide water at whatever temperature/volume is needed. Chiltrix makes one, I'm sure there are others.
if you're wanting simultaneous heating and cooling (one zone heating while another is cooling) then you need an even more complex setup.
example:https://www.chiltrix.com
they have a multitude of indoor unit styles to chose from, and you can feed a standard hydronic air handler as well. the outdoor unit will modulate the compressor to match demand between 25-100% of nameplate capacity.
the system you're asking for needs to be able to manage oil and refrigerant migration, be able to pump down the indoor units that are not active, and so on. these systems exist, usually in hotels/large buildings.
if you want to go this route, I think you'd be better off with one of those self-contained chilled water systems. then you just plumb pipes to each unit and fill it up, and the outdoor unit modulates to provide water at whatever temperature/volume is needed. Chiltrix makes one, I'm sure there are others.
if you're wanting simultaneous heating and cooling (one zone heating while another is cooling) then you need an even more complex setup.
example:https://www.chiltrix.com
they have a multitude of indoor unit styles to chose from, and you can feed a standard hydronic air handler as well. the outdoor unit will modulate the compressor to match demand between 25-100% of nameplate capacity.