I don't have any solution for jet-pack barons but -
I have a couple of these Skycutter crews I was planning on using to decorate my corsair venoms. Looking at them again this week I thought I might instead make them into barons, Voidstrikes or a mix of both. The elaborate scabbard/sword on the one could be either a power sword or void blade.
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Sorry about the watermarked image, it's the best resolution I could find.
If I use them as barons, I actually thought about magnetizing the heads as funny as that sounds. In this case I could swap them to a bubble head to indicate void armor, or a plastic farseer head (don't even know where I got those) to make them psykers.
I also bought a 3 pack of these a while ago and never found a use for them. To be honest I was dissapointed with the featureless underside of the model. I thought they might represent an HQ on a bike with a (shimmer, power, or shadow) field pretty well.
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They also come with a dual laser weapon which can easily pass for a twin linked... anything, along with the scatterlaser. This is good because I already used the scatters elsewhere.