I understand you're keen and ambitious, but a post like this would be decades away for you from now. You've not even started training as a pre reg student yet, I'd focus on getting onto that course first. You need years of experience, years of management experience at bands seven and eight and be able to beat all the other competition in highly competitive interviews.
I honestly don't understand why anyone who wants to do nursing would want to be a director of nursing, you never get to work with patients, are tied up in meetings, briefings and investigations and pretty much most of your interaction to do with patients will be when they've made a serious complaint that you have to investigate. Personally, I went into nursing to look after patients, when I'm old and my back has been put out from moving too many patients with the fuller figure I'll probably look at going into nurse education.
I know I've answered a few of your threads like this in a pretty negative fashion, however, I know what nurses are like, if you turn up telling people you're wanting to become a nurse practitioner or a director of nursing as a pre reg student they're not likely to take it as a positive attitude. They will assume you're not interested in learning about their role or make the assumption that you think you're above them (whether true or not). Nurses can be funny creatures. The best advice I can give you when wanting to do your nurse training it to focus on your placements and completing your course, make a good impression on placement, they'll remember you when recruiting and in job interviews. Doing well as a pre reg student is the best way to start doing well as a newly qualified nurse, which leads onto bigger and better things.