If you're not a Mentalist don't you it! That's my first opinion.
If you want to do magic "for kicks" then do magic but stop ruining mentalism by mixing the two. This hurts you in that you are not getting as strong an advantage as you could otherwise have if Mentalism were your primary area of focus and presentation. It hurts the craft in that you are presenting Mentalism with the mindset of it being "just a trick" rather than understanding how it can be much, much more. Finally, it hurts your audience in that you are not able to draw them in as part of the fantasy true mentalism allows them.
Magic is presented with an agreement between performer and patron; it is known that you are using trickery and it is your job to fool and entertainment doing such. With Mentalism you are soliciting an investment from the patron that involves belief; it does not matter is you are claiming to be Psychic, an expert in NLP or Body Language Reading or general Psychology, the claim you make must be both, plausible and viable, something your audience is willing to buy into and be a part of. If you just completed an Assembling Ace routine then move into some Swami Gimmick routine, you won't have that hook in place and thus, you create all the negatives noted above. So don't use the gimmick! Step back and decide if you are a magician or a mentalist and then focus your energy in becoming the best of whichever it is you want to claim yourself as being.
I know... a million and one people will now moan because of my "elitist attitude" which really isn't the case. I was a magician that did big illusions, the family show as well as a big blood & gore show but, I gradually moved away from that as circumstances in my life dictated it, investing myself more and more into a new field of study that became my mainstay. So I more than understand the "experimental" part in which we might blend and mix the two elements. It is because of those experiences however, that I came to understand the importance of keeping them segregated and why, if I were to go out and do a more traditional magic show, I do so under my stage name vs. the name I'm known by within the New Age and Metaphysical markets. I keep the two identities separate as well as the arts themselves.
No, I don't deny that I'm involved with magic... that would be quite impossible to do. But I am very careful in how I allow myself to tie them together, if at all.
When it comes to working a Swami Gimmick, you've already mentioned a few of the draw backs no matter what make you are using. That is why it is exceptionally rare that I ever employ one; especially when there are so many other ways of creating a similar demonstration... pocket writing actually being my preferred alternative though I don't use it all that much either (hard to do when you're sitting down...

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I'm not picking on you, just encourage you to think a bit.
