2. Wipe your PC.
Optional 2.5. Download a bunch of fake personal files.
3. Pass the border.
4. Access Internet.
5. Download your datas.
Then, upon reaching your destination, and knowing that no one had access to your random bits in the one-time-pad, download your documents from home, and decrypt it.
No amount of processing power by the NSA will be able to help them get your files, and the only way the bits of your documents pass through the internet, is if you can confirm that the key to decrypt the file hasn't been touched.
Otherwise you risk having all your hardware confiscated by border guards and returned months later. Your plan above won't work if they confiscate your hardware as you'll have nothing to download onto.
If anything, I would go to the point of screwing with border agents by having tens of thousands of pictures of my dogs, kids, flowers, and whatnot, all with naming similar to PICnnnnn or whatever is the current default of most digital cameras. Having them given the wrong doc type would be a nice touch too.
Of course why not store your data on a SD card and just pop it somewhere they are not bound to look?
Among other goals, they are assembling profiles on dissenters, to be used against them later. If you give them something that appears legal but still potentially embarrassing, that's disinformation that might save you from a stronger attack later.
This differs from a narcotics search in that having data on electronic devices is not a crime. They could not perform such a search anywhere but at a border crossing.
Requires a second wipe after step 3, and may get you into trouble, depending on what the crapware does without your input.