It makes me really sad that Microsoft gave up on the windows phone as it had the best user interface and the performance was great. It was an easy to use third option to Android and IOS. Although not open source.
2 more years and Postmarket OS will be just as old as the windows phone was when it shutdown.
Through an emulator, which would be even slower than the app running on an Android phone of the time, ruining the smooth WP experience? By making Windows Phone an Android skin?
Project Astoria was the last option I know of, apps ran natively.