Try to create a simple text file, with .pz2 as extension, and use it as a pose file for your character.
Its content: something like:

{
version
        {
        number 4
        }

       actor My_Character_Part
       {
              off
       }
}

Replace My_Character_Part by the name of the part you'd like to hide.
That's inspired  from an old set, so that it should do the trick for you as well.
Replace off by on to make the corresp. part visible.

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

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