There used to be a lay oracle of Dorje Shugden which I have heard of, but he was "fired" for making use of the trance to make money. I heard the guru ordered the protector to stop entering him, and since then, he is just a normal lay person.
I don't think "life-threatening" is a relevant point of discussion, if a Dorje Shugden oracle were to take trance in Dharamsala, of course it is life-threatening, if he were to take trance in China or USA, I don't see any danger, the CTA is definitely not rich and not smart enough to send assassin all the way there to kill the oracle.
Definitely an oracle of Dorje Shugden is beneficial, nothing better than to meet the King himself in person, not an ounce of negativity about this. If there is any problem, it is the oracle's problem (like the example above), nothing to do with Dorje Shugden.