Anecdotally, I can tell you that people I know IRL did indeed experience this phenomena. People argue left and right about the science behind this, and honestly I don't even care. One of the things about science is that when you see something happen directly from "variable x", you can create a very strong and supported assumption that it caused it.
If an individual was not experiencing hair loss, and then they add finasteride to the mix with their deca, and begin losing hair .....what do you think happened?
I would not do it.... regardless of what anybody says on the internet. Up to you to take it or leave it, because everybody has formulated their own opinion already, whether it's based on science or not. Make the decision yourself. If you want my input , I would say NO, don't do it. The question in this case becomes: would low cruise doses of nandrolone with finasteride cause hair loss to occur? None of us can really answer that for you because none of us are you. Yes, people can give their own reflections based on what happened to them or individual XYZ, but you are not them nor individual XYZ. What happens to you can be very different than what happens to somebody else. Hate to give you that "generic answer", but it is simply the truth -- the truth that you will have to discover this for yourself.
I would like to add though, that I was talking about people that run 1k+ test and 600+ deca, alongside 100+ oxandrin a day, etc. If you're just taking a low dose, it's extremely difficult to say what would happen, especially because everybody is very unique in their reactions. Quite frankly, the only way you can know if this will or will not happen to you, is if you do it yourself. I have a feeling, as I said before, that it will indeed spark an increase in androgenic alopecia.
If I were in your position, I would possibly try just cruising on Deca alone. Obviously add 100-175testosterone a week to keep your normal physiological functions in check, and not give yourself the chance of having a compromised immune system; but this is always a plausible option. If you find you dislike it, then you will have lived and learned what does or doesn't work with you. Personally, I don't like seeing individuals using other drugs just so that they can use a particular drug. I would try to drop the finasteride out of the picture so you don't have to deal with the slew of side effects which can occur from that drug. It would be better to simply cruise on low dose testosterone, which should keep your DHT levels low, or nandrolone coupled with TRT.
Let us know what you decide !