Not usually a fixed fanatic, but after A&S with 76", the LEL profile, with most climbs around 3% and only rarely up to 5%, it seems doable, even suitable 😍 at a notch or 2 lower gear.
Will of course do the ancien thing of flipping the rear wheel around for another gear, and leave spare cogs and tools at bag drop.
Other considerations would be that the fixed wheel isn't tubeless, and there will be no respite from any saddle sore that arises...