Stormonu
NeoGrognard
I think I would do it where some player-facing option rules would be in the PHB, then referenced in the DMG (and repeated in full, if short enough - like Sized Armor). Then some additional ones only in the DMG - Wealth-per-level, Variant Rest Options, Resurrection Drawbacks, Honor, Sanity, Patrons, Bastions/Bases, Boons, Firearms, Optional Expanded Criticals, Purchasing Magical Items, Carousing, Level Training, XP options (including XP for GP), and so on.