Not meaning to bust your balls or anything, but 'moving bitcoin' across any border is sort of a 'non sequitur'. The coins exist only on the interwebs (or the first distributed republic if you wish). To 'move' the coins you would only need a way to transfer a private key (or seed phrase) from one region to another, and I believe this can be done within the blockchain itself (perhaps with a little help of pgp or the likes) (in that sense, it would be an interesting philosophical question in what regards 'turing complete' is applicable to the blockchain existance as a whole, but I am drifting way off point). I think your main point is: "how to buy/sell millions worth of bitcoin without upsetting the market?". I would say: just dump them on the first exchange that proves liquid and start a panic fire sale, then buy part (or all) of it back and be home free. But that is of course a bit tongue in cheek.