Welcome to the forum, George. You seem to be interested in developing your higher human potentials, so I was wondering if you are familiar with the works of G.I. Gurdjieff, Boris Mouravieff, or Carlos Castaneda? We discuss those authors a lot in a section of the forum we call The Work, because they contain many clues on how to develop our minds and personalities, becoming better people and also possibly unlocking other higher abilities in the process. According to the C's, many people have these higher potentials, but we cannot access them due to pollution in our bodies and minds from toxic foods, environments, as well as false personality and the many I's that derail our focus and ability to serve others or be objective in our thinking. There's a smorgasbord of information out there, so dig in!
Regarding whether or not Tesla had a machine that could unlock certain abilities like clairvoyance, it is really hard to see how useful that information would be, especially if it is, like you said, most likely secreted away in some CIA database somewhere. It's possible Tesla was a unique individual in terms of his superhuman intelligence thanks to some interaction with his DNA and his essence or soul... There are cases of some families carrying hereditary powers of healing or telepathy, but are otherwise spiritually undeveloped individuals. I guess another part of the notion of an instant-enlightenment machine that rubs me the wrong way is that it seems to bypass a lot of the internal work on oneself that is necessary to stimulate spiritual growth and maturity. Almost like a free lunch, or a shortcut. I'm not in the position to say such an instrument would be impossible though, especially if such an instrument requires the individual to focus and work hard in order to function properly. Who knows