Simply send all your holding coins with a low transaction fee. This will make it easy to hold them for a couple of weeks.
Is anyone doing this?
Why would anyone want to do this? Isn't just keep them in the wallet a better option? Why would you want to risk it?
Are you doing this? Why?
It's like a fat guy putting a locket on his freezer and throwing the key, or cutting your cc card to make sure you don't go on an x-mas spending spree.
It's good for people with low determination to keep doing or keep from doing stuff.
But just like in my examples it's nothing bulletproof.
If he panics he will re broadcast the tx with a higher fee to get the coins to the exchange to sell them.Simple.
But all that said, I must award him one satoshi for ingenuity.