Re: "I'm no expert but I researched this last..." — Look, I've spent twenty-five years in the shop and I've learned one thing: the smallest part isn't...
TL;DR: You need a brick with PPS 3.0 that hits the 3.3V-11V at 3A range to get the 27W max. Ngl I am in the exact same boat right now... just pre-orde...
In my experience, sticking with the ecosystem is the most reliable path for hardware synergy. tbh I've tried many flagship sets and OnePlus+Buds+Pro+2...