With a rare medical condition like this, I don't think you ought to be taking 'advice' or reassurances from a parenting message board. Don't get me wrong, I am a die-hard, long time poster of MN - under my Christmas name (since 04) but most posters cannot be of any useful help to you, me included.
If I were you, I would get in touch with AIMS, www.aims.org.uk for further qualified, independent and supportive of you evidence based information.
the mention of things like syntocinon really worries me. From how I know syntocinon works, it will put a strain on your blood pressure which may increase you likelihood of some of the same things that supposedly they are trying to avoid.
Episiotomy and forceps, I dunno. I may be speaking out my arse end here but from what I have read, the approach the transition is the most intense physically and mentally and therefore more likely to put a strain on your blood pressure, and the so called pushing stage not so bad at all, especially if a woman is encouraged to give birth in positions that suit her ie, not lying down which coincidentally seems the most preferred in hospitals.
A friend of mine who gave birth in Norway last month had acupuncture, given by the midwives. I should think that is a fab way for keeping a woman's blood pressure down as the later stages of labour approaches. Also, consider natal hypnotherapy which is self hypnosis.
You may think those two proposals are all airy fairy and lentil weaving but irregardless of what your philosophies are, please please please visit the AIMS website and give them a call as your situation is very unique.
If you have the money consider an independent midwife or experienced doula who can also advocate on your behalf with the hospital.