Not 100% sure I'm understanding you correctly, but if I am you're saying that you have a situation where a single model with 1 wound that is not a character is closer to a 10-man unit (each of which can fire 1 shot) than a character model is to that 10-man unit.
In this case, no, the whole 10 man unit has to choose its targets prior to making any shots. You won't be able to kill the 1-man unit and allow "spill over fire" into the character afterwards.
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