In your third image, I think I can see several dissectum leaves remaining at the top. If so, you can still have the 'crimson queen' cultivar, but this would be best used as a landscape tree....If you want to do this, I'd start thinning out the foliage growing from the root stock now as it will be stronger then the grafted foliage and will eventually overtake it. If you want to work with the root stock (best way to go if wanting a bonsai), I'd chop just above where the root stock foliage is growing, then leave alone for the rest of the season.