I know I've mentioned this before somewhere, but if I were in charge of adapting the later novels, the road I'd take would be to go straight from CoD to HoD. Not skipping GEoD altogether exactly, but fold the important parts of it back into the narrative of Hod & CHoD as backstory. That can be done though simple world-building exposition or more directly though Other Memory flashbacks. Several Duncans were there for the whole thing after all, as was Siona who would become the ancestor of most, if not all of the Bene Gesserit by that point.
There's even several narrative links that could support this already present withing the text: both the archaeologist prologue and the hidden prescient message left by Leto at the ruins of Sietch Tabr.