Pasting the entity setting should respect the individual permissions which prevented you to do the changes on an entity in the first place. You obviously can remove the "Paste entity settings" permissions, but that is a powerful feature you usually don't want to remove.
- Build two spltters
- Set priority configuration on one splitter
- Remove the "Set priority splitter" from your permissions, but keep the "Paste entity setting".
- Change the priority settings from the second splitter. The configuration isn't saved since you don't have permissions.
- Copy/Paste the entity settings from one splitter to the other.