IMO a binoviewer on a spotting scope is a bit of a stretch, the fov is going to be limited & fast moving objects like water craft will be hard to follow - i suggest a good pair of bnoculars, with a fov of 6 deg -obviously waterproof will also be necessary.
Then buy a good telephoto lens for the slr.
The spotting scopes you refer to like Nikon's are every good products, but expensive for what they are - i think the binos and telephoto will work out cheaper.
What f/l were you looking at for the spot scope? & what kind of magnification/fov are you interested in?
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