Thanks for your replies!

I've tried Nugraf 64 but it was disappointing. Importing the .sat worked but on exporting it to sketchup I got an error before it even started. I also tried importing an .fbx and exporting that as sketchup but there was very bad triangulation.

Moi generates the best geometry conversion from sat to Sketchup I have seen so far. We'd be willing to purchase half a dozen licenses if it was able to generate materials so feel free to contact us as soon as Moi has got this running.

It would also be great if every .sat solid would be put on an individual group. No need for nesting, but now everything is one giant group. Having a separate group for each element would help.