Take the Hogan and see if you pass, first. If for some reason it doesn't work out, then there is no reason to stress. If you are successful, I could almost guarantee that HR would be willing to work with you on scheduling an interview at the earliest date you can accommodate - it really isn't too much to worry about. The only downside is that you could lose seniority at UA by delaying your interview to complete training at a company where you really have no intention of staying. My two cents.