My GF had her tailbone broken by her first baby 6 years ago and had a bad back from it until her second child was born 3 and a half years ago. The first birth was natural (no interventions at all) and the second was the same. I don't even think she considered elective C for the second, she just went for it. No problems with the second, it also ended up being intervention-free and her back is not nearly as bad since the second one.
If you plan to have an elective C, that's one thing, if you want a natural birth (no induction, epi etc) you really have to go into it without planning for an emergency C. I'd allow for it in the birth plan, but not structure the Plan A part around Part B. To avoid an emergency C (and there is no real reason it should get to that stage, is there? I mean, if you don't have interventions?) you really need to have faith in your body's ability to adapt for birthing (and it does!), because if you embed into your plan a blueprint for interventions, that's statistically very likely to be what you'll get, culminating in an emerg C.
So, a previously broken tail bone does not preclude you from a genuinely natural birth (if you are induced, it's not natural, even if that's the only intervention you have), in the experiences of people here and elsewhere (i.e. my friend) who have had them the first time round
Also, please don't forget to look into how the interventions affect your baby as a neonate, because they will. The interventions may help you give birth, and there is a trade-off that isn't favourable for the reason you're getting them, unfortunately. When you look into the effects on the baby you can also then embed into your plan way to counteract those effects as best as humanly possible - as was said previously, see if you can have immediate skin-to-skin contact to enhance establishment of BFing etc, or it might sway you to avoid intervention all together and go natural.
Remember that without being induced you will give your body enough time to produce natural endorphins which will assist in masking any tailbone discomfort, if any. Endorphins are only produced when adrenaline is suppressed, which means working on remaining in a relaxed state

Good luck!
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