Keep it mumsy , why throw it away when you can experiment with it .
I have found that many EDT's can take a small percentage of essential oil & in most cases alters it sufficiently .
I have done this often & my next step will be to sourc synthetics .
Is the Patchouli you are planning on using a natural or synthetic ?
I recomend you eventually get some perfumers alcohol or high content vodka to add to the fun .