I would be tempted to have some custom TGV-delete style plates made with a hole in the side and capped off at the top to avoid having to remove the intake manifold. combine that with a walnut blaster hose designed to plug into it and all you'd have to do is make sure those valves are closed and you can blast away. maybe this is a bit simplistic but if it worked it would turn this from a nightmare into a slightly more complicated TGV delete install.