Yes, an idea to remove most effects from abilities so the only affect ability checks/skills. Have abilities only have mostly RP value. all combat is based on your level. In all other aspects of the game; attacks, saves, damage and DC's, ability mod would be replaced by your proficiency bonus...
Dark Vision Variant: 3e Night Vision and Dark Vision
Proficiency Variant: Skill Points
Combat Variant: Touch AC and Flat-Footed
Combat Variant: Armor as DR
Combat Variant: Wound/Vitality
Combat Variant: Glancing Blow
Leveling variant: Slower Progression