A multi-stage day: hot tar at 777 m, freezing summit at 5,895 m, bike cached at 3,760 m for ~8 hours. The kit problem is range — you must carry for both extremes and survive a solo mishap.
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⚠ The solo factor. You're alone on your own line at extreme altitude with a long technical bike descent at the end. Everything in SAFETY is non-negotiable — a turned ankle on the crux or a crash on the jagged descent, unaided, is the real danger of this day, far more than fitness. Tell someone your route and your turnaround time, and carry the means to call for help.