Do psychedelic and meditation lead to the glimpse of the same Brahman?

Before I dive into explaining what I’m thinking, I want to make clear that I revere Advaitic Vedantic philosophies and I’m on this path for a while now. But like it teaches, I don’t want to consume it blindly, rather experience it myself. Also I have never done any psychedelics but read a lot about it, like I have studied the Advaitism.

Going scientifically, I found some similarities in experiences people share about the ego dissolution through either the substance or deep meditation. When the Default Mode Network activity of the brain is reduced to minimal, one loses the ego and the conditioning is shed off, hence one experiences unity, non separation and expansionism. Question is, is this experience a mere construct of the brain then? Brahman is something which cannot be comprehended by the faculties of the mind, but how different is it from the one induced by psychedelics?

I could never experience the unity, but I wonder if the experience of Brahman can come for so “cheap” like with a shot of a drug? I know it can’t be! I need reinforcements here!

I really crave to get just one glimpse of the Brahman, I could trade off anything for it. I know the very desire stops me from achieving it. But doesn’t the Bhagavat Gita say that a deep desire of the God with total surrender without an iota of doubt shall grant it (Bhakti Yog)? Is there a conflict between that desire and non desire here?

I know the questions here are scattered and kinda incoherent, but I am writing this from a point of deep craving to feel it once, please pity on my desperation and share your wisdom that you gained in this path.