Okay, visual stimuli won't work. But your sense of touch and your sense of hearing are both fine, right?
What do you want to try?
We need to set up a rhythmic pattern of sensations for you to concentrate on, so that I can begin implanting suggestions to liberate your subconscious.
Like maybe we drop a spanner on his head every 10 seconds?
What a coincidence. That's almost exactly what I did not have in mind.
Kevyn has spanners.