…not sure what your languages are, but if you can make the argument that your master’s is relevant to potential doctoral thesis work (and it very well could be given your interests), then that master’s degree might be a strong asset. Think of your job here as a little bit of marketing… figuring out how your background helps in preparing you to meet the goals associated with a Ph.D. program.

Of course since you already have your master’s, you know the importance of personal contact. Before applying, I’d spend some time contacting potential doctoral advisors and talking over possibilities with them. Getting one or more of them on your side can be critical to getting into a graduate program.

I say do some prep work on this (above) and go for it! Good luck! …sounds like the beginnings of a potentially very interesting career.