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What about hydro-air? Get a small wall mount direct vent LP boiler. Add a heating coil to the downstairs air handler.
Same could be done to the upstairs unit if you could get PEX tubing upstairs. Not recommended if the air handler is in unconditioned space like an attic, but the system could have glycol added.
This way you keep both air handlers. Get duel fuel thermostats so the boiler kicks in below freezing instead of the HP. Combo units could supply your domestic HW also.

Stay away from ventless heaters and fireplaces. The CO danger is not worth the risk.
 
You might be able to get gas furnaces tied into your current ductwork, depending on how much space you have.
Wall hung boiler or furnace will require exhaust venting. 90% units will offer PVC venting but these are not recommended for unconditioned attic spaces. Electric HW tank now? Do you want to replace that also?
 
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