I can map your migration 404s to live pages, but I will not send them all to the home page, and I need some inputs before I start.
Why not the home page: each dead URL should go to the live page on the same topic. If there is no such page it stays a 404. Sending unrelated URLs to the home page drops visitors somewhere that does not match the link they clicked.
Required: 1. Dead URLs with referring domains and a topic clue. For /old-shop/item?id=88, /en/page-4, /team, /careers/2019 and the rest you mentioned ("here are some"), I need each URL's current status (404 or 410), its referring domain count, and its top anchor text or old page title. An Ahrefs Best by links report or Semrush Backlink Analytics filtered to broken pages gives these. /old-shop/item?id=88 and /en/page-4 do not name a topic, so without an anchor or old title they stay 404. 2. Live pages. The live URLs that return 200, each with its topic, for example whether a current team page or careers page exists. That is the list I match against.
Defaults for optional items: - min_ref_domains: 1, so any dead URL with at least one referring domain is considered. - existing_redirects: none known. If the migration added redirect rules, send them so I can avoid chains; otherwise I only check chains within this map.
When I have these I will return the dead URL table, a one hop redirect map with the matched words for each row, the Leave as 404 list, and referring domain totals. No rule is added without your approval.