Theoretically, this would be a self-contained system — the only point of failure is AWS itself. As long as you load your account with a few thousand bucks, perhaps it will last “forever”.
I also like pg’s philosophy of "just pretend https doesn’t exist", but if it’s guaranteed that the automation won’t fail, it seems gratuitously fussy to insist on plain http.
Is there really no way to date a cert for a century?