I am seriously thinking of commissioning a simple tungsten cube emblazoned with cuneiform style figures, set up on a stainless steel platform. For the legacy. For someone millions of years from now.
Yes, you’re crazy. Stainless steel won’t last a million years. Not even close. You should go with titanium instead. That would also create a massive density difference between the two pieces in case someone lifts them up separately. Feeling the weight difference of the two pieces is very confusing for most people.
Your schlong will not last as long as that material allows for. So I'd go with a titanium casting of it, complete with vulgarities, like the graffiti in Pompeii