Too funny!
I had two students that I put on the harness to do loop jumps one day. I fully admit my reason for doing it was purely to let them show off. They shared a lesson, so I couldn't put one on the harness and not the other.
The first girl was doing a video project on the physics of ice skating and she wanted to include some footage of how the harness helps with learning jumps. Valid reason and I was happy to help out - she NAILED a beautiful loop jump with no assistance from me other than keeping the bar from hitting her head. The skill disappeared once the harness came off, but the project received an A++ grade, so that's all that mattered.
The other student did a few loops on-harness rather wobbly but her visiting grandparents were thrilled because they'd never seen a harness in use before. (Their DD/girl's mom was a roller skater as a youth.) The next week, the second girl asked if we could use the harness again for loop jumps. I said, "Okay, just do a few loop jumps just to warm up before we put the harness on." She landed four or five and then still wanted to wear the harness for the jump! I nicknamed her "Mary Martin" because she always want to fly on the wires.
Sometimes, it's okay to use wacky rewards to get results. I told one student that she could do her elaborate "victory dance" on the ice if she did all four scratch spin stages. She did it, she danced it, I watched, I clapped and laughed.