The thing is celesse, if you're planning on signing off AMA on these things anyways, the nurses, midwife and consultant won't really care what your reasons are, nor will they battle with you over them at that appt. it's your right to refuse and as long as its on paper, they're in the free and clear. And surely they won't look up the articles etc to find flaws to argue about or something like that. It's like them coming to a Jehovah's Witness with a bunch of facts about blood products, he/she still won't believe in it or sign the consent. Yes the example a refusal based on religion, but all I'm saying is they can't make you believe their way is best and most won't waste their breath trying to convince you if they know you'll be signing off AMA.
Anyways, these are kind of standard things to refuse, but given your history/ case it does make them a bit more risky. and as long as youre aware of the risks and as long as their butts aren't on the line, aka you've signed that you're refusing xxx it doesn't matter if your reason is well supported or not, they are legally off the hook, which is really why those policies and protocols are in place. The risk of putting in an IV early is peanuts compared to the risk of not administering a medication or blood in an emergency... So in their minds, why not? Same with monitoring etc. plus it all serves as support in court if need be.
All this said, if it is an emergency or if there are indications that it may be beneficial for you to have these things don't be surprised if they mention it even if it is written explicitly or already signed off on... Ex. If through intermittent fetal heart auscultation they're hearing decels, I would expect they might want to hook you up to the monitor... If you're in the middle of another pph and don't have an IV, they'll probably bring it up... I hope you understand this, I know you want to be in a calm, organized state to make these decisions but in certain circumstances this is impossible. And I would hope that you would want to be offered xyz if the situation really called for it.
All in all I don't think your refusals are way 'out there' it's just your history that makes you a person they'd deffijitely would want to have extra monitoring, IV access etc just in case. Yes it will be against their policies and protocols but I wouldn't imagine the evidence behind your decision is much different than anyone else who doesn't want those interventions, yes maybe an extra study on vbacs or pph management etc but I imagine its nothing extraordinary... Ykwim? They still all impede the natural progress of labour, lead to more interventions etc...
Anyways I hope they are understanding and truly I hope you get the experience you want since it hasn't been that way in the past. But again, I hope you are informed enough to accept their offer in the moment if need be... You know it's serious when they want to reconsider something that's signed off AMA, yes they're not legally obliged to but they are there to keep you and babe safe...
Cheers!