Having looked at the reverse of this i.e. remove aircon in full for standard blower, I'd say the easiest option is a full swap from a climate car.
If the difference in climate and aircon is anything like climate and poverty spec whic I think it may be, you will need dash loom and control panel then maybe engine loom, blower and heater matrix.
It sounds major but its not too bad. Whether it's worth the cost and effort is another question.