If you thought we should wait for your Jacobs piping expert (A gentleman visited you last week) to see what the recommendation. Up to you.
If the information will come quick ,it should be good if not I would go for Hastelloy C as this is good enough to source for material
from MJBangkok. They have Hastelloy C276 sold in Thai Market so we shouldn't need Hastelloy C-22 (Saweglok VCR) same before.
(You can find quotation in separate mail I sent last week that have been quoted from MJBagkok to K.Padet)