"make any effort at all" =/= "no akrasia"
If you expect that he'd make some effort, and be defeated by akrasia, then clearly, you are not confident that he would do well.
My point isn't that, however. My point is that karma is inappropriate collateral, even if there were some easy way to move it from one person to another.
Here's our place to discuss Less Wrong topics that have not appeared in recent posts. Have fun building smaller brains inside of your brains (or not, as you please).