I'd be willing to help out if somebody else would like to take a stab at it.
I've been working on a Castles & Crusades ruleset for probably a year, and it's at a usable level.
13th Age is completely doable.
Though, with how easy it really is to create characters by hand, may be overkill.
Castles & Crusades Ruleset for Hero Lab
Hero Lab (5E D&D) -> Fantasy Grounds Character Converter
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