About the time that Core Competencies came into being, they did introduce an Acquisition Stream. As I remember it, you had to apply to enter that stream by providing evidence that you had the necessary skills/experience and pertinent qualifications.
I was accepted into that stream on the basis of having done Aerosystems, a tour at A&AEE Boscombe Down and by being at that time mid-tour at DPA Abbey Wood where I had done the Risk Management Course.
I don't think the Acquisition Stream idea really went anywhere though, unless someone knows different, although I did subsequently bag a tour in a Systems Program Office at Naval Air Systems Command, NAS Patuxent River.