Yes you can mix inks. Just do some test models to see what looks best. Once you've found something you like, I'd suggest that you mix up a big supply of your ink combination. You're doing a whole army with it, you don't want to have to keep re-mixing it and getting varying results.
For example, on my Blood Angels, one of the first steps I did on them was an ink wash. I mixed a number of inks, plus some water, plus some clear medium to give the right consistency and color for washing my models.
You don't have to ink purple on purple. You could use straight black if you need dark. Don't be too linear in your thinking. Some of the most impressive and striking models have different colors working together. The PP Trollbloods are a great example. Blue skin, pink recesses, up to fleshtone highlights. All very different colors, but all working together to create a really neat look.
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