Another shroud would surely pose a restriction on the whole rad, reducing it's 160mm exposed surface down to the area of a 120mm hole... again defeating the purpose of the rad...
Why make/buy a low restriction rad, just to restrict it again during the mounting? Why go for the "how it's recommended" option on the orientation and airflow direction of the fan if you're not going to go with the recommended option for the air inlet? The benefits of one will likely be negated by not going with the other...
Easier and more satisfactory solution to me which would offer the best performance in your case would be to make do with pushing air thru rather than pulling, and mount rad < shroud < fan < case.
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