I don;t think if you work through consultant it will take time for your visa stamping. I also work through Consultancy and I was in Nepal three week before . I got mine and my wife visa in just after 2 days( usual processing time) . Just get the department of labor stamped in Nepal as I heard sometimes people in immigration hard time on that one. It just takes like 2 hours at Department of Labor in Baneswor. Enjoy your stay in Nepal and don;t worry about working as consultant.Regarding interview date if you reach Nepal on Monday and get date for interview you will get date for Friday . If you have at about 2 weeks holiday in Nepal not much worrying about. Regarding getting appointment for visa didn;t know we could get just with Passport photocopy Nice to know it as it would help me other time. I thought they needed original.