Thank you both for your replies and advices.
I never knew about this softer stock.. I ll read about it.
I am shooting a test tomorrow. It is going to be in a very different environment (grey/brown/ January Greenford parking lot! No sand..) but will help figure things out.
I am leaning toward shooting 200T, and testing it with and without color correction also. I think it might be useful not to have to compensated for the filter on the exposure. Have you ever color corrected afterwards? I had a chat with the house who is doing the transfer to make sure it will be all good -it is-but I was wondering if you had a though on this.
I will be shooting on the beach, with pink sand, and looking at ways to cut some of the reflexions from the sand, notably on close(r) shots. Anyhow, it should be fun (and then days of anxiety episodes before to see the rushes!) !