There’s really no need to freeze it to the eight. Simply getting it close to the eoght, anywhere near that rail, with the eight between the Cue Ball and the 12 should do it. It just needs to be close enough to the eighth to not leave a jump.Oof this feels dangerous. If you don’t freeze the rock on the 8 he can easily make his ten rail first and run out or resafe you with an easy kick.
The more I think about it though, I think the same order and then use the seven to bump out the eight leaves leaves the out without too much drama…