[p]>[m]?

Given a pre-bronze people whose L1 contains [m] as the only bilabial but is
rich in aspirated & non-aspirated dentals, velars, and uvulars: how would
they most likely hear and reproduce initial [p] & [p_h] and terminal [p_}]
on first encountering a foreign language with all 3? Would [p] & [p_h]
collapse to [m]? and [p_}] to [?]?

Thanks

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