What I'm perceiving is that your experiences have demonstrated that health care professionals have treated/are treating you as an incubator for this "very important" baby, rather than an intelligent pregnant woman who's already had two children without problems. You know the score, you feel well and would prefer to proceed without intervention to avoid being treated like a meat locker.
This is understandable.
I also perceive that you are asking if anyone else on MN has chosen this path and what was their experience. You're being met with judgment which is not helpful.
I believe that by asking for experiences you want to use this information to make a considered decision about whether you have antenatal care or not.
All of this tells me you are carefully weighing up your options to make the best decision for you and the baby.
This is to be commended.
To add to your information, I used to work for a neonatal research unit at Oxford University, years ago. A lot of years ago. So I can't tell you what the latest advice is.
What I CAN tell you is that best practice is informed by clinical trials that will have worked out that the additional appointments/scans generally lead to better outcomes in the population as a whole.
This means that more often than not, having additional scans and appointments has reduced the risk of disability and/or death in babies and/or mothers.
What this means in your situation, given that you've had two pregnancies already, is that you may be fine and your baby may be fine or something else might come up that puts you and/or your baby in jeopardy.
It also means that there will have been enough cases of maternal or baby death or disability in otherwise healthy women, that could have been avoided or reduced if this had been picked up at a scan. It's also likely that NICE have decided that more appointments will reduce bad outcomes.
I haven't read any research papers on this, but if the best advice is to have more scans and appointments than was previously advised, then it's very, very likely (given the pressures on the NHS) that more appointments have saved lives or reduced serious disability to a significant level.
Turning back to you, it seems that you are probably going to be fine, but it's worth considering that otherwise healthy women may only have had serious issues identified when they had a later scan.
It's not for me to advise you whether to have the appointments/scans or not. They are there to ensure that women and their babies have the best outcomes possible.
I think NHS obstetrics services could do more to treat women as thinking human beings but like many services there isn't the time, inclination or money to invest.
I'm sure you have the best interests of your health and your baby in mind. If you were treated as the intelligent and experienced woman you are, would you have the apppintments/scans? And if the answer is yes, then it's the attitudes that need to change, not the number of appointments and scans.
I wish you a safe delivery.