I've previously worked in very busy pediatric departments of community health centers, and GYN care and immunizations are both topics that I dealt with frequently in those settings.
I'll start with immunizations. As nurses, we're driven to follow Evidence Based Practice as much as possible, and to present patients with credible, accurate health information so that they can make informed healthcare decisions. If your research into immunizations somehow results in an alternative schedule being your EBP, then so be it. There are certainly plenty of families out there who want a provider who is open to discussing when and how to vaccinate their children, and they will flock to providers who provide alternative scheduling. Keep in mind, though, that if you're working in a practice with other providers, some practices create uniform policies regarding immunizations, and your differing views may not be welcome in the practice.
Regarding GYN care, plenty of providers who deal with women's health do not do every single GYN procedure. Many will refer women out to other providers for abnormal Pap smear follow-ups, IUD and other birth control placements, abortions, etc. Prescribing is a little different, especially with meds such as Plan B, which are very time-sensitive and should be taken ASAP. I think the important thing here is that, again, you present patients with accurate and complete information, so that they can make their own informed decisions about their health. Also, think about your own liability in those situations (ex. not counselling a patient about Plan B when it's a viable option for her unplanned sexual encounter, and then she winds up with an unwanted pregnancy and gets an abortion instead, which is a much more complex process on so many levels). Whether or not you want to do something for a patient, they still have the right to be told what their options are, and then you help them make a plan from that point (referral to other provider, etc.). Again, which practice you work in can make this a lot easier or harder for you- a religious institution will probably have more set protocols for you to follow in certain situations, and that may help guide your practice a lot better and make things easier for you. You could also try to gravitate to different populations of patients that may have less reproductive health needs, such as the elderly, though I'm not sure you'll ever completely avoid these issues.
In keeping this as neutral as possible, I hope this provides some guidance.