I would shoot the 8 straight ahead with force follow and put the cue ball on his side rail at the first diamond. You could get very lucky.
With the balls as they are you need to something dramatic.
I initially wanted to shoot this also, but when the cue ball is close to the object ball it's a bit harder to control the deflection. If he returns the intentional and puts be back behind the 8, my hope is he's left me further away so I can shoot the 8 like you suggest.