I build rental houses periodically (would rather stay with r22 and was thinking post phase out when parts were available but no complete r22 system. So could this be accomplished with a compressor and txv changeout or are other parts involved. This is all hypothetical.
You would be alot cheaper off either just swapping out the 410A and putting a R-22 in it's place or selling one and buying the R-22. It's too much work to make it worth having done and would in effect be a waste of your's and the contractors time to mess with. Besides I don't think this qualifys for a hypothetical question.