You can put Curse of Binding on pumpkins and on elytra and then equip them, making these items permanently stuck to your player character as they cannot be removed through durability exhaustion (or other means). The only way to get rid of them without the use of commands is through dying, HOWEVER not even this is an option if you are playing either in hardcore mode or with the keepInventory gamerule set to true.

Suggested resolutions: a) Prevent survival mode players from obtaining pumpkins or elytra with curse of binding (simple but doesn't fix the issue in existing worlds if you equipped one such item in a previous version) or b) Add a survival-friendly feature to un-equip items with this enchantment.