sorry for delayed response but the toucher will significantly diminish your battery. "That characterization came from user yillbs on MacRumors.com. “I don’t think anyone can convince me that this thing isn’t just flat out the worst battery life ever on a MacBook,” yillbs wrote, clearly frustrated. “I’ve been defending it like mad, but at this point... how can you? 4.42 hours is just bad.”-PC world. As you can see your touch bar will kill the incoming charge at a rate that is ridiculous, even if you turned it off it would still affect the performance. you would need to have brightness almost zero, touchbar off, all apps/pages closed, and back lit keyboard off to maybe get a bit of charge. unless Anker releases a 60W PD in quarter 4, (please Anker!!!!) which would be Novemeber/December, I do not believe that it will work for you.
P.S I haven't tried this but maybe two power core 26800 PDs connect to the computer may work. note, I do not condone this and am not responsible for fire, damage, burns, lacerations, and or death