Yes, I am sure EA could work with a qualified hypnotherapist to work out the suggestive language and proper stereo audio effects to induce trance.
That site you mention looks interesting, and I think I may well give one of them a go. However, I don’t see why BALG cannot put together an all purpose, TGS/Rapture programme that gives the operator freedom to call upon any spirit they desire. It would also be good if it started with an invocation of omnipotence meditation.
Essentially, this idea came to me last night after I read this thread and remembered I have a Paul McKenna confidence hypnosis app and thought I would re-visit it. Also, I thought GGC’s NAP ritual (which is - to all intents and purposes - a self hypnosis narrative) was excellent for getting into state…but reading through it lessens its potency, and listening to my own (unprofessionally) recorded voice trying to sound all serious just put me off!!! So, I have thought that it would be much greater if there was a professionally produced version of that.
A BALG self-hypnosis for soul travel would be excellent as well to induce that state between awake/asleep, vibrations and swooning that precursor AP!