We investigate inflationary magnetogenesis in a scenario where conformal invariance of electromagnetism is broken through a . We account for electromagnetic backreaction and the Schwinger effect, analyzing both standard single-field inflation and a generalized K-essence framework, . We consider inflationary potentials compatible with Planck satellite constraints, including Starobinsky and $\alpha$-attractor models for large-fields, as well as hilltop scenarios for small-fields. Moreover, we explore very different functional electromagnetic couplings, introducing a novel ansatz modeled for small-fields. We show that the non-minimal coupling plays a central role in controlling the dynamics, . This leads to a deep modification of the magnetogenesis process. Indeed, the amplitude of the generated magnetic fields can be enhanced by several orders of magnitude with respect to the minimally coupled case, reaching present-day values up to $B_0\sim {10}^{-19}G$ in large-field scenarios, . Conversely, small-field models yield negligible magnetic amplitudes and appear non-predictive within our non-minimal framework.