How do I remove enchant limit when combining items.

Hello I'm wondering how would I be able to make it so when I combine for example an efficiency 5 pickaxe and a fortune 5 pickaxe to get an efficincy 5 and fortune 5 pickaxe. The way it currently works is that it gives me an efficiency 5 fortune 3 pickaxe. At the same time I don't want players to be able to upgrade enchants (for example fortune 3 + fortune 3 making fortune 4). Is there any plugins that do this?
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