Neil - I don't see how Chris can keep doing Cibas now that his last incoming order is over 10 years old. Hopefully, the rolls were kept frozen. He also had to resort to a third party to replicate some of the chemistry. And he's gotta be getting up there in age, so now mostly smaller camera work I suspect. At today's rates, shooting 8x10 chromes amounts to about $50 per shot with processing (he probably stockpiled some of that too), plus the expense of multiple 8X10 masking film sheets per image.
After the demise of Ciba, I sold off all my 8X10 chrome film, and replaced it with Ektar color neg film, which I still have a good stash of in my freezer, for sake of printing on Fuji Supergloss instead. The Fuji version is even better. But if I want to print chromes on it, I have to generate a precision interneg for it first, including the masking steps - so at today's rates, around $200 in materials expense per 8X10 image just to set up for printing. Add all the fussy labor, and it's gotta be a labor of love; it wouldn't be commercially realistic for a lab to do that - they'd scan the original and output the Supergloss print using a big laser printing device instead, linked to the RA4 processor.
Bracketing 8x10 shots has never been realistic, for several reasons : the sheer cost; lighting and motion can change surprisingly quickly in the field in relation to those slower exposures; and even more significantly, 8x10 holders weigh quite a bit and are bulky, so you can only tote a limited number of them in your pack at a time. The first shot has to count. But I never bracketed 4x5 shots either.