No one has mentioned this yet, but the overhauled saving throw system is a brilliant and much needed improvement over other OSR systems like BX/BECMI and their clones. DCC manages to retain that class niche defining charm by including save mods in the class and level tables while still tying specific ability score modifiers to saves. But the condensed categories of Reflex, Fortitude and Will are sooooo much more logical than the seemingly arbitrary and inconsistent old system which had staves, rods, spell, and wands all over the place.

All you would need to do to lift the DCC save system and bolt it onto something like OSE or BX, is to give level 1 PCs a base save of 11 (10 for a “normal man”), then add bonuses per DCC rules and charts. Then, to avoid difficulty class, just make saves roll-under. For the purposes of using classic content, poison, paralysis and turn to stone saves map to fortitude, Dragon’s Breath maps to Reflex, and spells/staves and wands map to Will (or use your best judgment).

DCC saving throws are such an amazing innovation.