I would argue that a 3/4 year full undergraduate Aeronautical Engineering degree would be wasting precious years.
With your existing degree (you do not state discipline precisely but I assume "Aeronautical Technology"'ish) I would expect that you will have little problem entering an M.Sc. programme - that would not be the issue here - what would be is entering a heavyweight programme with significant quantitative content.
Arguably your length of time away from study coupled with the lighter initial exposure to Math/Physics may see some admissions tutors reluctance in this respect (the maths can be brutal) but I expect with your other experience you will arguably be better qualified than many of them in other relevant respects.
My serious advice is to only really look at one year MSc programmes from decent institutions and preferably with "Engineering" in the title (implying some decent quantitative content).
Under no circumstances do I personally recommend you repeat a full undergraduate degree (but if you really wanted to I expect you could get 1 or 2 years of exemptions).
In fact with your experience (from what I can see) it might be possible to enter some of these Postgraduate programmes without a first degree.
My opinion only
