Create a process with no primary object, and a step to run your chosen job / parameters.
Create another process, and within the GEL make an invokeAction/Process web service call (see:
http://yourserver/niku/wsdl/InvokeAction) to the XOG end point. It's indirect to have a 2nd process to give you the item you can call on demand, but as a route and solution, it is supported.