onetime.codes: Share your 2FA codes with trusted contacts.

Hey! This project has not officially been built yet, I'm gauging interest before diving in (hence why the images above are just shots from the registration page!). The idea is for the customer to use a generated number when using 2FA, then we'll forward the codes we receive via SMS to their email address. We will never have enough information to access their account for the 3rd party service, and we'll only be processing the codes. Users will be able to add other trusted contacts to forward SMSs from particular services to, or they can use it for personal use and not have to update everything when they change their phone numbers. So, what do you think? Is this something you would use? If I go ahead with it, I'm intending to build it as an Open Startup and share progress in public.