Holden,
That's what I do. My structure is Mystery Method, but I fill it with, mostly, spontaneous material, and I throw here and there some lines and tricks of my own that have proven very useful in the past. Maybe 70% spontaneous, 20% canned of my own and 10% canned from elsewhere but which fits my personality in a congruent form.
Another tip: if you're unsure about purchasing Mystery Method, just subscribe to the newsletter. It has many useful tips and excerpts from the book.
Beware of "The Game" and its morality. It's a mainstream book and it has to say some moral stuff in order to appeal to the masses. I don't like social robots and I don't think it's the way to go, but it's better to be a social robot than to be a chump. And it's better to be a social robot at the very beginning, so you can learn and later naturalize, than to never learn at all.
Every new thing you learn is at first unnatural to you. Until you internalize it, then it becomes a part of your personality. This is as true for playing guitar, as for public speaking, as for picking up girls.
The problems are the social robots that lack any depth of character, any personality or lifestyle. They will be social robots forever. But I've not seen many of those, they are the exception. Usually being a social robot is just a stage for the majority of us.
Oh, BTW,
TylerDurden from
The Game is not a social robot. He's a really cool guy. But Style had to put someone as the villain, and chose Tyler

but in real life they get along pretty well.