Work is ongoing to use FiatCrypto-based implementations for the primitives, which is discussed a bit here:
https://www.crowdsupply.com/sutajio-kosagi/precursor/updates...
https://www.crowdsupply.com/sutajio-kosagi/precursor/updates...
Also interesting to see the Precursor project getting so deep in the weeds! I saw that project on crowd supply months ago and thought it was notable.