Rather than make a whole new plate an easy way is to augment training is to just pick any NDB approach out the real book of plates plates and add 2000 ft to every altitude with a grease pencil on a plastic cover. Find a convienent AM radio station and go for it. I also tried to enter the approach off a published transition rather than just go straight to the station to make the exercise more realistic. Also I get the student to do a ground briefing where the appraoch used is the end of a complete simulated flight.