It's entirely up to you which of their guidelines you choose to follow.
They can't MAKE you do anything, but they can argue with you about it,
lol.
So just be sure in what you want & be prepared to fight for it...choose what matters & let the rest go.
For me, I really wanted an active labour & I was totally prepared to argue about being chained to the bed, I wanted freedom to turn off the monitors for a bit If I wanted to shower etc. Didn't happen, but that was for reasons totally unrelated to VBAC - it would have been like that in any labour.
As for going in as soon as labour starts...well, they can't do anything about it if you turn up later....
I do suggest though, having a chat to them about why they have these policies. I guess if you are going to choose to follow or not to, it helps to know why they are there. It did help me to decide which ones I wanted to follow & which I didn't.
Good luck!