Leave the solar cell home. It is not worth the carry. A full charge each morning, and a small(ish) power bank are more than enough.
The power bank should be able to fully charge your device at least once. More is better, but adds grams of weight.
I also carry a 3-way splitter so two others can share one outlet if needed. This will have single, male, 2-prong, type C “Schuko” plug, and two or three 2-prong female receptacles.
Find one online, or in a local Ferreteria (hardware store), or in a China store. They only cost a few Euro. Your fellow pilgrims will love you for the consideration.
Weight is the enemy.
Hope this helps.
Tom