This is technically true, but the UX for this is so horrendous it's hardly worth taking seriously. If people are willing to put up with bad UX we could instead

This is technically true, but the UX for this is so horrendous it's hardly worth taking seriously. If people are willing to put up with bad UX we could instead use TLS client certificates, which are still _much better_ than saving a page that has JS SRI in it (at least it's in the browser!) and has _much better_ cryptographic properties. (And that's assuming that you could somehow get the origin issues right.)