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Custom ROMs have had just about enough of being Android's second-class citizens
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
There's a few apps that let you virtualize an older version of Android, but in my experience they're slow, and they're all from sketchy-looking Chinese companies that are for sure harvesting all your data. There's also an open source project running for this, but I don't remember what it was called and it was fairly limited.