Not sure if anyone is interested, but I wrote and play-tested with three different groups a Dune scenario “Casus Belli at Mount Kellen”. I’d be happy to share the link to the Google doc write-up to folks who PM me. Or pass on to Modiphius if they have a repository of fan-made scenarios. It worked quite nicely the couple of times I played it. I have difficulties finding a regular group to play Dune, although I got very intrigued by the system, and I designed a scenario that specifically exploit several interesting mechanics (the warfare and intrigue conflicts specifically).
The mining concession on planet Lemnos is uneasily split between House Kira and House Safr according to an old CHOAM sanctioned treaty. However, the recent discovery of a vein of Rheingold on Mount Kellen has reignited the feud between the two Houses, with both houses laying claim over their rights to extract this metal, highly sought after by the Tleilaxu for their cloning technology. Both houses have already moved troops around the disputed area and filed formal complaints to the Emperor. Tension is rising to untenable levels and House Neleus (player house), known for its talents in diplomacy and mediation, is asked by the Emperor himself to find a peaceful resolution of this conflict.
Houses Kira and Safr are meeting at an old compound in the Kellen Mountain, in a round of negotiations organized by House Neleus. The houses have reluctantly agreed to a 24-hour window to come to a settlement. The action takes place over one evening of formalities, possibly one night of warfare, and one day of negotiations.