Crossbow
Seeking Honesty and Sanity
Or even better, in the hand of a Monarch!
The Constitution has held up pretty well for 230 years, I am certain that it does not need input from a minor colony of Australia
In case it missed your keen eye for detail, the US Constitution has been officially modified and amended quite a few times since its inception.
Therefore, one should expect to periodically see suggestions for various alterations to the US Constitution from any number of sources.