If it were me, I would rig up a heat pump water heater and run some hydronic space heaters in the small rooms. Each could have its own thermostat to be adjusted for individual comfort levels, drawing tiny fan power when active (50-75 cfm). Or you could install passive baseboard or "radiator" units with honeywell valves (or sophisticated electronic controls) for temp control. The tank heat pump would not short cycle like an air source unit would under low load conditions. Instead of running linesets into each room, evacuating and charging, some easy pex lines would suppliy hot water to the heaters.
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