Adding to the end of a cleanout
I'm remodeling an 1965 California home with 100% copper plumbing. I'd like to add a small sink in the kitchen and the plumbing that is right below the intended area has what looks to be a 2.5" straight threaded cleanout. I'd like to remove the cleanout plug, extend outward 2 feet with ABS and attach a new ABS cleanout/drain inlet. Does this sound like it would work and are there any issues using a male threaded ABS adapter with a female copper receiver?
Thanks in advance.