The Herbarium BCM, where I have been collaborating since 2022, It's one of the few Herbarium with a 100% of specimens digitalized. May you find inspiration at the website, where you also can contact the workers: https://www.geoportal.ulpgc.es/herbariobcm/index.html#/
They are also some Herbariums asossiations like "Society of Herbarium Curators" or "AHIM", for Macaronesia where you may find answers.