Seems like you have a good plan but don't use denatured alcohol. It has an added scent that will wreak havoc on your mix. Go to a liquor store and get some Everclear for your mixes. Its the best thing short of perfumer's alcohol and its odorless for your purposes.
Diffusion is not a problem with most pheromone products. Alcohol based products diffuse very rapidly and the bigger challenge is to know when and if to re-apply. If you mix NPA with an alcohol based scent or straight alcohol it will not affect diffusion in the slightest in the early stages of application. After the dry down of the pheromones and cover scent the pheromones will stick as a part of your signature and diffuse less broadly.
Good luck!
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