Without going into the finite details, I too had a higher degree (and a lot of years of experience in that field) when I jumped ship and went to nursing school. Some people in the nursing field had told me, too, that I might be a "difficult" hire (my age, my former degrees, my new-nurse status after nursing school). My experience has been anything but that. Many doors opened for me both in regards to choosing the nursing program I wanted to attend as well as first-job offers. Plenty of job offers came in well before graduation. Plenty of places courted me and very much appreciated the professional experience/s I brought with me before nursing school.
Though I'm happy to report that doors opened for me, one of my nursing instructors had a great piece of advice not only to me but to everyone else in my nursing school cohort (many of us were career-changers) when someone voiced concern about new-nurse marketability and being "an older" hire as a new nurse. Our instructor told us: "well, if they don't want to hire you for those reasons, why would you want to work there anyway?" And she was right. Plenty of hospitals, from Level I trauma centers to community hospitals and plenty in between, are happy to have a new nurse who brings with him/her life experiences as well as those from another career.
And I never had anyone ask me if I was going to run for the hills after I got a bit of experience to go do X, Y, Z with my former career experience. Truth be told, plenty of nurses who are not career changers or who are of the "typical" new nurse age (is there such a thing any more?) leave their jobs after just a few years of experience. In fact, I remember reading an academic article in the last few years that studied RNs of various ages and their longevity in their first hospital job. (I tried finding this, but can't right now.) The study in fact found that new RNs over 40 were actually more likely to stay in their job if they got the kind of unit they wanted right out of the gate.
Anyway, just another perspective to add to the bunch.