For decades Wall Street traders have been throwing spreadsheets over the wall at developers to be productionized.

The details are very different, but variations on this theme have played out for a long time. I have seen fixed income instrument modeling systems 20 years ago that allowed Traders to put in limited C++ code to define new exotic instruments.

At least that stuff had guardrails around it.

>allowed Traders to put in limited C++

This is gold! :-))