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aah like that, yes it should be possible, easier to buy a new spindle but, yes this is doable.

For which cam software?, theres very likely a free drag and drop solution, by the cam software themselves.

Be SURE to inspect the machine before you buy in person, check for any sinister stuff in the electrical box at the back, like all wires sprawled out of the trunking, oil on the floor of the box,...

With enough work probably, not sure if its really worth it though, what for?

Check thrust bearings, mechanical backlash with a dti, and runout on the screw, of course dont change any params without saving the original values, and go from there, good luck.

haas says to cycle the power and try again, but its probably the motor itself, the cables, or maybe even the mocon, try to narrow these down.

Did you get this solved?,
this could be a tool pocket spring error, or a servo error,
not entirely sure, check your carasual pockets.