I agree this solution/workaround doesn't deserve a beauty price, but it is all we got for now.
The problem is that it seems not be possible that (unlike a Windows application) if you remove a application from a Android device it automatically will be removed from your account.
That is what avast told a while ago.
To me it seems not hard to do.
Click on the "remove button" in a application.
Ask for a confirmation.
If confirmed, connect to the account and remove the application from it.
Remove the application.
But that is just me logical thinking
As for the wrong status of AMS and/or AT in the account, that is something avast has been working on for many months and still haven't solved.