This reminds me of our prior discussion of God as immanent, created prosthesis. Recall:
Betcher, quoting Bruns: "God does not generate love in us, but rather, our loving generates God" (72). Which is consistent with God as a conceptual prosthesis, one generated by our embodiment and connected to the abstract universal principle. But a principle that is not a source from some ideal universal that works its way down into embodiment. Which is what I was talking about in my last post. This is how we can have a universal that is not transcendent but transcendental.
Spirit as prosthesis is specifically used as a metaphor, one embodied in the artifact of a 'crutch.' I prefer the more general metaphor of 'tool' though, as this expands our embodied, embedded and enactive interactions with/in the contexts and hyperobjects in which we participate. In this sense then concepts are indeed useful, expanding tools as long as we keep the transcendental deduction's origin down below* instead of up above. Or as Betcher says, "openness to the intercorporeal field" (72).
* They got one thing in common, the fire down below.