That Xerces doc is a great resource for sure. Here is a condensed version, by one of the same authors (Eric Lee-Mader; likely with help from his wife and business partner, I assume?)
https://northwestmeadowscapes.com/pages/planting-advice
I think the “Long Term Management” recommendations on page 10 of the Xerces document above are really worth checking out and considering when trying to maintain a meadow over the years. This is a type of ecosystem that is usually dependent on some kind of disturbance– whether that be through mowing, fire, and/or herbivory. However, we also want to be careful about the amount of disturbance to minimize any negative effects on butterflies and other species that might take up residence there.
