Yes, of course it's possible to configure GSX for such airplanes, the engine type is not really relevant, if the airplane is reasonably large, most of GSX services should adapt with no issues. Only the smaller planes might not be able to use all services.
No, GSX doesn't reply any of the default ground vehicles, except for the pushback truck, so they'll continue to be used by AI planes. When you call GSX, all default ground vehicles that might already be around your airplane will be automatically removed.