Start off with a near 1:1 translation of G1 but diverge once we hit Metru Nui and instead stay with the original cast, following them around as, with Mata Nui relatively safe, they go out to explore the world, gradually meeting more Toa (each representing new elements, rather than rehashing the same 6) one at a time and helping them with their problems, discovering new masks and dealing with strange monsters (which never come in sets of 6 recolors). A greater focus would be placed on the elemental powers- where G1 gradually moved away from this, to the point where it was pretty much gimmick blasters, the toy line would instead double down on this and have each toa have more and more aesthetic pieces derived from their element as they get upgrades and stuff, such as, say, a flame cape for Tahu, or ice pauldrons for Kopaka.
Makuta's one guy, the Turaga aren't ex-Toa, Matoran don't promote to Toahood (but have things of their own they can do that are special). The main overarching plot becomes a quest to awaken Mata Nui, a quest which Makuta, in various forms, always tries to thwart. New locations would generally correspond to parts of Mata Nui's body (ex an archipelago of toes).