For the CCS, PCS and Infantry Squad the wording is pretty clear, "...Other Guardsman..." "...remaining Guardsman that has not been upgraded...", the only possibility I see (having spent all of three minutes on the problem) is in a Vet squad with the Demolitions doctrine to give the Vox guy the Demo charge (though I'm sure that's not what you had in mind).
If anyone else has spotted a way round it, please chime in.
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