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My name is Billy. While physically possible...this would require an entire rebuild both refrigerant based and wiring based.
Odds are the conversion would cost more than what the unit cost.
There are also txv and piping changes inside the unit. This change could easily be over $1500
My concern...and I feel for your your situation...is that once you do all this work you will have no warranty.
Now you can remove the entire wiring harness and replace, install defrost board, cut all piping back to coil and and compressor and build a new manifold with outdoor txv, reverse valve etc.
Honestly in 25 years I have never seen it done. But in theory the same compressor, fan motor etc....you will just be starting from scratch.
I apologize as I know from a rebuild perspective it is possible...but I have no first hand knowledge of actually completing this task