I have done some aluminum repairs by using small size Cu/Al split bolts with Deox to convert to Copper wire for connection to receptacles. These are UL approved for Cu to Al connections.I tape the splice with 3M tape. I advise the customer in writing to re-torque all Aluminum connections every 5 years and to repair all Al splices, but they just want to fix the "burned outlets." I think all the Cu/Al wire nuts (purple?) are no longer UL listed.
It may be cheaper to re-wire a house with Copper than to Copalum all outlets. If I were Copalum certified, I would want $150 hr. per electrician. But where would you find work?