See this edit https://en.wikipedia.org/w/index.php?title=North_Korea%E2%80%93United_States_relations&diff=1166108949&oldid=1166101987 where I had to do a lot of manual copy pasting to get it done right.

first I automatically got the metadata using the archive url
then move the archive url to the right field
then paste in the correct original url
the fiddle with the archive date despite it being already in the wayback machine url
etc.

this could all be done automatically based on the webarchive template