Indy, I've seen a couple of posts you've made where you refer to the "liquid fueled engine" in the Argus. It's not liquid-fueled. Blau gas or fuel gas used to power the Argus engine. While the compressed version of the fuel is liquid, the Argus sections behind the head contain the gaseous fuel.
Indy, I have no insight on electric motors for UAVs. If WSGI is responding to RFQ, they have had at least 12 months to design system. The Augus gas engine has gimbals for steering airship, electric propulsion might have gimbals or twin propellers (?)