It would be VERY useful to switch to the debug camera, fly around somewhere then possesst your character to the new position. Currently the only option is to either use the debug camera or not and there is currently no option to “bring” the character to the new position. I actually created this and tried to sell on the marketplace (under the name FlyCam) it was denied, but you can still see a better example of what I mean. This feature would be very useful and I think it is “missing” from not already existing.
You could submit a pull request on the UE github repo and try to get it merged into the Engine.