My 'In Case of Emergency Transfer' document (because if I transfer, it will likely be due to a situation likely requiring a c-section because I wouldn't go in otherwise) has no 'please' or 'I'd prefer' or 'unless deemed necessary' in it. I kept it short and reasonable, but it's assertive. All of those statements are absolutely up for individual interpretation and do not contain a definitive consent/refusal of consent. My plan contains legal and binding statements of consent/refusal of consent to treatment that are only amendable by my husband or my signature on individual items. My husband will not be signing any admitting paperwork that voids my statements of consent/do not consent. He will only sign a consent to treat that does not conflict with our transfer plan. I'm constantly amazed at the misinformation thrown about that doctors and nurses have the right to "allow" or "not allow" a woman to exercise her legal rights in labor and delivery. It may be an uphill battle (which is why we are choosing an out-of-hospital birth), but the rights are there nonetheless..
In regards to the bolded and underlined:
You need to know that a birth plan is not a legal document. It is neither binding upon you nor upon doctors and nurses who have not reviewed its terms prior to your hospital admission. Even birth plans that are reviewed by health care professionals in advance are not considered legal directives.
In the event of a transfer for emergency or c-section, it is unlikely that you or your partner will have the leisure to review admitting paperwork in the kind of detail you describe. It is probable that hospital personnel responding to emergency will have very limited opportunity to review your paperwork. They may not be able to read your birth plan at all. It is also possible that the emergency you are transferring for may involve issues, conditions or considerations that you didn't imagine when making your birth plan, and consequently didn't discuss in your documentation.
In an emergency, moving your treatment forward is more important than wrangling over legalities. It's a good idea to make some contact with the hospital in advance to find out what their policies and procedures are, and what you should expect if you have to go there. You can also get copies of their standard admission paperwork, and discuss them with department if there are significant issues. You need to be flexible, because you don't know for sure what you will need if an emergency arises.