If you did not do so already, create a gmail account tied to the hobby GV number. Then create a separate user on the phone who has that gmail account (easy with Android). Then switch to that user when you want access to your hobby number, and only use Hangouts, never the phone message or voice apps. You can delete that user at will and everything will stay in the hobby gmail account, and you can add the user to your phone whenever you want. You can also open a web browser, go the hobby gmail account, and use the phone and txt functions there without a phone.
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