I agree it's sensible to be somewhat wary of inducing hallucinations, but you're talking with a level of confidence in the hypothesis that it will in fact harm you to induce hallucinations in this particular way that I don't think is merited by what you know about tulpas. Do you have an actual causal model that describes how this harm might come about?
(There often is no need for an actual causal model to strongly believe in an effect, correlation is sufficient. Some of the most commonly used pharmaceutical substances had/still have an unknown causal mechanism for their effect. Still, I do have one in this case:)
You are teaching your brain to create false sensory inputs, and to assign agency to those false inputs where non is there.
Once you've broken down those barriers and overcome your brain's inside-outside classifier - training which may be in part innate and in part established in your earliest inf...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.