if your last action was a successful melee Strike against a foe using a combination weapon, you can make a ranged Strike with the combination weapon against that foe without fully switching to the ranged weapon usage, firing the ranged weapon just as you hit with the melee attack. In this case, the combination weapon returns to its melee usage after the ranged weapon Strike.
It pretty clearly says 'ranged Strike'. Subordinate Actions rules wouldn't let you substitute Ricochet Shot or Risky Reload for that Strike action.
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So you make a successful melee strike, so you don't need to switch modes to make your next ranged strike against that target.
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As an aside, I see how that might play out with a combination firearm, but I'm having trouble visualizing that process for a Bow Staff. You hit someone with it in staff form and then somehow immediately fire an arrow without needing to string the bow? It seems weird.