Here are some links to other sites and resources you may find useful :
Singing Games and Rhymes for EY and Middle Years – National Youth Choir of Scotland
PRIMARY MUSIC | Benedetti Foundation – resources written by BKA member, Jimmy Rotherham, of Feversham Primary Academy, for children ages 4-7, and 7-11
doremi connect – Nurture and lifelong learning for musicians and teachers – run by Kodály specialist, Helen Russell – online courses for musicianship, music teaching, piano teaching and more.
Here is a link to a site with resources for piano players, suggested by Callie, which is on a site advertising wrist bands, but it seems quite useful https://www.wristbandexpress.com/content/hand-wrist-finger-positioning-guide-piano-players/