The problem means to pursue sustainable eco-entropy as redundancy (constraints) or marginal profit, value, and diversity. Therefore, this paper will discuss the following problem of realizing the DX-like microcosm of the ternary/pair-map with allowance (buffer), its eco-entropy scheme, and managerial diversity of nature versus artifacts’ body, on the sandwich theory. First, an outline of ternary sandwich (SW)/pair-map is geometrically prepared, along with the introduction and discussion of the eco-entropy concept, based on three types of energy, economy, and information structure without buffer. Subsequently, a managerial problem of body’s diversity is proposed and formulated, based on topics within the spectrum of the 3M & I world. Next, the relaxation problem of ternary SW/pair-map with allowance (buffer/delay), will be remarked as the case of demand-equals-supply (without buffer), and re-named as an allowed buffer type of ternary SW, or a 2-center case of demand versus supply (with buffer). Finally, the better realization problem will be formulated by the class of eigenvalue or progressive type, under certain indications of the eco-entropy class concept, and also, a systematic unification of ternary SW/pair-map is geometrically realized at 3D type. This approach towards human-friendly and sustainable nature versus artifacts’ body, may be incorporated into such the practical object of bodies (on vector space) as enterprise, economic structures, and Sustainable Development Goals (SDGs), in the near future.