I’m only suggesting that theories which are not supported by direct anthropological evidence are worth considering

You can consider an idea and build a theory around it, but once your basic idea is disproven, your whole theory disappears. And the idea that the Sphinx erosion doesn't match the agreed upon age has already been proven wrong - as in, it has been explained that the observed erosion is perfectly compatible with what rock types are there and with the data that we know since the actual period it was built in, the mid third millenium BCE. So you don't have your premise that the erosion doesn't match the official age, and that means there is nothing left to consider here until you actually have something new, anything else is fanfiction.

Considering new idea is perfectly fine, no one disagrees with that, but you are not considering new ideas, you are considering old ideas that were proven wrong and not listening when someone tells you why it's wrong. Get new material.