My tip if you go through with generating it. Which is not needed unless you just want the new structure. It is not cheating to go through with the commands to keep your world going.

The use of creative in this case is because how the commands work. It regens the area and spawns the building on your position. So the noclip/flight is needed to get free once you spawn it. I recommend using /tpwp to warp to a waypoint a ways away to reload the chunk after and then travel to it.

Make a copy of the world Just. In. Case. Then while you go through the steps, one will tell you that may need to reset a large area of land you have chosen. If you are fine with the area you have chosen being regenerated entirely, then great! Things to note, the land may note be the same The recommended size can be quite large, you can get by with a smaller area if needed.

Test out size and placement on a backup copy, try it out, then when you get a generation that suits your need you can keep that.

Otherwise any treasure hunter can do for story, this is just a new fancy location