Android applications and Google Play Store on Chrome OS - Testing Platform

Question

There is an Android applications and Google Play Store support in official Chrome OS from version 53: https://support.google.com/chromebook/answer/7021273?hl=en

Is there an emulator/testing platform available in addition to official Chromebooks?

I tried CloudReady from Neverwhere:

https://www.neverware.com/freedownload

And builds from:

https://arnoldthebat.co.uk

All these builds are based on version 53 or higher, but none of these support Android Apps/Google Play Store.