I couldn't remember to save the replays, unfortunately, for Duel Triangle. But in general you want access to Ogier and either Renaud/Oliver. Ogier to send whatever you'd need for the line (9/10 times it is Turpin, sometimes Oliver if you have things like Almace access in hand) and special summon Angelica. Use a grave equip effect (usually Turpin, sometimes Oliver, rarely Ogier) to target Angelica, and chain Angelica's self-banish to send whatever you need to the grave (Level 1 Roland for Ring access in End Phase with Charles, Gearfried if Renaud/Almace is open). Use Museum to search an equip of choice depending on what your hand started with, and use whatever that Equip is (usually Durendal/Almace) to allow for Turpin to revive itself and go into Charles with the Synchro Roland. From there, if you had tuner access via Oliver or Renaud still, use them with a Gearfried to go into Baronne for an omni-negate and keep Charles on board with equip. Level 1 Roland fetches Ring to hand, which then equips itself to Charles in End Phase for an extra Spell negate.

It's ironically more complicated than having Link/XYZ access due to needing to be selective with what equips and what warriors you start with since you don't have Isolde to basically pick whatever you want.