I look forward to reading your answer and recommendation as it regards to the aforementioned “residential dwelling” application, and I hope that yours will be the solution that wins over this customer’s financial heart.
Most contractors know NRTL's failed #12 back-stabbed plugs over 30yrs ago, call backs from burn up failures are not compatible with warranty call backs, while old plugs in general fall apart when removed.
Further, complete remodel wiriing is different from service repairs.
This has been discussed before on this forum.
My work is limited to minor repair only. My forum profile, website link, shows how unlicensed contractors are legally disgorged of all payment, if total invoice exceeds $500, per State law.
My business advertises this unlicensed limit for minor repairs, along with CEU's, and commercial general liability coverage for repair of power failures, 1 circuit at a time. My clients don't have a choice to violate code, or void their insurance policy.