Ionized medium without omitting EM physics

Geant4 Version: geant4-11-00-patch-02
Operating System: OSX Monterey
Compiler/Version: gcc
CMake Version: 3.21.3

Hi experts,
I am trying to simulate proton ion propagation in ionized medium.
Simulating an ionized medium, I want the projectile ion to interact electromagnetically with the nuclei in the medium, but not with the electrons.

The only way I found so far to omit EM interactions of the projectile with the electrons in the medium is by omitting the EM physics list altogether. However, this also omits EM interactions of the projectile with the target nuclei.

Is there a way to retain EM interactions but just to omit electrons from the medium?

p.s. I am using Had03 example.

Thanks

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