My combat-free B/X hack #osr was quite quick to do - it mostly just meant deleting stuff. No AC, weapons, armour, combat spells (including the "non-lethal weapon" ones, sorry no Sleep). A lot of OSE is stuff like travel rules.

I did leave weapon-like tools and protective clothing, but there are no rules for fighting with them.

Adventures might be more significant in terms of exploring this thought experiment - they more specifically indicate what the game might look like with no fights.