> could I strap my Pro to my old DJI drone and create some photogrammetry of my house or whatever?
Yep that should be possible - as long as you flow below 5 metres though!
If you have a drone and are somewhere that is legal & safe to fly, photogrammetry (3d model from just visual photos) will likely give a better result than relying on the iPhone LiDAR stitching.
Set the drone image self timer to 2 seconds, fly around for a bit and then upload all the photos into WebODM: https://opendronemap.org/webodm/
You can run it on your local machine (see instructions in blog post) or hosted for a fee. It creates brilliant models and is a lot of fun!