I'd say just cnc it. I have a very similar if not identical machine and I've been contemplating the same question. If you are going to convert to cnc then I don't know what advantage the G0602 gives you? They are nearly the same in dimensions of length and swing. The only reason to sell of the 3-in-1 to get a new machine is to go up (or down) in size. All the threading gearbox options are redundant for cnc, and you'll probably want to convert the spindle motor to variable speed too.
For me I'm keeping mine and decapitating it - I won't need the mill part once (if?) my IH clone shows up.
If I was looking for a new (or used) lathe to cnc I'd want to find one with a cam lock spindle for easier chuck changes.