As a photographer you should know that any telephoto lens is very unstable and usually requires a tripod imagine putting the same lens on a moving drone !!!! remember it is not a true tele X7 it is a crop from the centre of the image. hth Mike...
If I swam in that position, I would get sooo much water up my nose, I'd think I was waterboarded! Some great footage you have managed to capture there, well done. I'm surprised that you were able to post to YouTube with that copyrighted Movie...
If this is a once-in-a-lifetime thing, it would be a crying shame to miss the opportunity.
I would imagine that the road trip you have planned will have certain key points where you will have envisioned taking aerial shots. Before you head off...