We've discussed this repeatedly here. I am sure a quick search would turn up some additional information regarding it, but in short, MIG does not compete with plasma HF and components very well. There are technical issues regarding it, and are two completely different processes: CV vs. CC. Tig and Plasma are CC. Mig is CV. But that is not the major issue. The Tig plamas still require separate inverters to produce the individual processes. Adding a CV circuit requires enormous extra components and space. It is easier to add CC to a CV machine, than CV to a CC machine as well. But the frequencies and tuning of the plasma can burn out the CV side.
No you can't hook up a spool gun to a CC machine.
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