This is based on https://ifttt.com/recipes/149597-save-my-ios-reminders-to-an-evernote-checklist
Then
Append a to-do to note
This Action will append a to-do checkbox to a note as determined by its title and notebook. Once a note’s size reaches 2MB a new note will be created.
Discover more time saving integrations for Evernote and iOS Reminders