You could add this indirection layer with something like JMP instead.

With https://jmp.chat/ you don't need a SIM card at all - you just login to your phone number with an XMPP client (SMS/MMS) or SIP client (voice) and use it wherever you have an Internet connection. If you only want to use it at home, you can just use wifi and don't need to pay any cell carrier. But if you do want access to your number away from wifi, you can get a cheap data-only plan and use XMPP/SIP clients on your phone too. It's always up to you if you want to be tracked - you can turn off your phone('s modem) and use your number only over wifi whenever you like.

And it's easy to transfer your existing number into JMP - see https://jmp.chat/#existing for details.