I found this thing:
https://beefortressusa.com
which is pretty much your idea, and the guy claims it works.
If ratchet straps are strong enough to hold the thing together, then instead of strapping the hive to a concrete pad, I would think it would be just as robust to strap it to a stout tree. I'm just not sure I believe the straps really are that strong, or that the wood of the hive is. (I'm actually using hollowed out logs, which did survive the bear attack intact, so maybe as long as the bear couldn't knock it apart, that would work.
I'm not too worried about dropping the whole thing. I was thinking of strapping everything together, hoisting it into the tree, and strapping it to the tree, and leaving it attached with a strong rope or cable, which could then lower it back down. At any rate, I wouldn't be under it at the time.