A quick restart of Proteus, and there it was—a sleek, multi-pin version of the LM2596 that actually supported the wide 3V to 40V input range his hardware required.
OUT (pin2) ──┬── L1 ──┬── C2 ── GND │ │ D1 VOUT (+5V) │ │ GND └── R1 ──┬── FB (pin4) R2 │ GND ON/OFF (pin5) ── GND (tie to GND for always ON) proteus lm2596 library updated
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