In the old mans war books they cover that by having the old and new bodies staring at each other while they move the consciousness. So one minute you're staring at a new body then you're staring at both then gradually the vision of the new body fades out and you're left staring at your old body.

I think something similar is the only way you're going to get people to want to do this. Though whether or not that is possible is way beyond me.