Yes, there is a temptation to play dangerous games, and I suppose that goes with the urge to practise bdsm. We learn from our mistakes. We learn even more by surviving our mistakes. We also learn to warn others against making the same mistakes! There is a deep excitement in coming so close to the edge that uncertainties or risks creep in. I plead guilty to having had the same kind of feelings and experiences.
I suppose that works the same in many kinds of dangerous sport, whether it is climbing the face of a mountain, sailing round the world alone or trekking across the Kalahari desert. The risk is a part of the excitement and the greater the risk, the greater the satisfaction.
In r/l bdsm, the more you specify what is going to happen, the less easily the Master can create extra excitement by doing something new or surprising. Surprises are like the cream on the cake. They are a way for a scene to exceed the sub's expectations. Risks are like an extra spice that can make it unbelievable.
I believe there is a place for fantasies that are too extreme to be acted out, like those depicted in DolcettŐs art. I have fantasy ideas that I find provocative, erotic and entertaining, and like the substance of dreams, these are often both extreme and impractical. I write stuff because it gives me a buzz, not because you can do it. Credibility helps though.
If you want to play out your dream, I do understand. I did not mean to suggest otherwise. The most erotic crucifixion story I remember was called My Body, by an unknown author. It involved a woman who had large piercings all over her body for steel bolts that were part of a crucifixion rig she had invented. It was a real work of art. Of course it was a fantasy, but you never know. If her idea worked, the fantasy was perfectly survivable. I do hope that your experience will be, too.
Personally I am fascinated by the psychology that makes extreme kinds of fantasy work. There is crucifixion for some, the guillotine for others, asphyxia, being eaten by animals, being impaled, even being roasted on a spit a la Dolcett, grilled in an oven or boiled in a pot. In a fantasy world, such things can be portrayed as normal everyday events without stretching credibility. Doing them in the real world is another thing entirely. I care far too much for people to suggest any such thing.