Your inquiry made me curious! And so, I researched what CRAPPER is all about. It is indeed a great design and inspiration for a compact toilet. Crapper is a slang word for toilet; if used in its context, it wouldn’t sound offensive.
While exploring your options, make sure to incorporate these additional design considerations for Dawul Wuru and Yirrganydji Country context : protecting Country, flexibility, transportability, and seasonality.
Good luck with your further research!