Extraction of hop aroma is a balance between temperature and time. The oils extracted and retained during dry hopping differ from the range extracted by heating. Also, the alcohol in the brew will extract components that using water won't. If you boil hops for a tea, the results will be more like adding the hops to the wort, than dry hopping. So, a five minute boil would be like increasing your aroma hop add.
The hop oil I have is made by steeping hops in 50% alcohol at room temperature. This is a commercial product, but I know the person who makes it. You could try it using a vodka with very little flavor.
And as always, post the results.
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