set output and trigger them without override a default entity

[kem008]

I am trying to add more functions for an entity.
The entity is prop_physics_override if I try to edit it it can be broken

Like lose the model and the physics itself.
The output is OnPlayerUse other mods using this output.
I am trying to get the key and value and trigger them on USE function.
Is there any way to avoid the default entity override?