This paper develops a controlled infrared route from an explicitly diverse microscopic scalar substrate to a near-Maxwellian vector sector. The goal is not to derive full electromagnetism or quantum electrodynamics, but to identify a mathematically transparent set of infrared conditions under which a Maxwell-like effective description can emerge from a current-current sector built on collective FIA modes. The distinctive feature of the present framework is that microscopic diversity is kept explicit throughout the equations. Rather than beginning from exact microscopic identity and exact gauge symmetry, the construction organizes the substrate into approximate scalar pairs, derives an approximate current, and tracks how diversity controls both the transverse response that supports a Maxwell-like limit and the residual terms that obstruct exact microscopic symmetry. The contribution to theoretical physics is therefore methodological as well as conceptual: the paper provides a diversity-retaining infrared template for connecting microscopic scalar sectors to emergent vector descriptions. The resulting claim is deliberately narrow but strong. FIA diversity does not yet yield exact electromagnetism, but it can support a near-Maxwellian infrared vector sector whose standard limit and structured deviations are both mathematically explicit.