This makes Beeper mini no different from all the other iMessage for Android apps, such as AirMessage or BlueBubbles, both of which require installing a server side component on a Mac. That method works because it is actually using iMessage and routing it through to an Android app. This “fix” is likely to hold since others have been doing this for years and Apple hasn’t done anything to block those. I haven’t compared features side-by-side, but AirMessage and BlueBubbles are free, while I think Beeper mini charges a monthly fee.