Beeper's last attempt at iMessage on Android is hereBeeper has released an update that restores iMessage on Android through its apps via a Mac or iPhone for registration. If that doesn't work, Beeper is giving up.
Source: Beeper's last attempt at iMessage on Android is here (https://www.androidcentral.com/apps-software/beeper-gives-android-imessage-app-one-more-go)