Guess you are not familar with Stephen Johnson?
http://www.ekcsm.org/bios_johnson.html
Art is of course different to all but Johnson uses a digital back on a 4x5 camera
and stitches the results together (digital backs only capture 60 percent). He
works only in color that I know of. His work is considered art and I assume
purchased as such.
As to printing, look into Lightjet output. This is continous tone photoprinting
on archival photographic paper from digital files.
I shoot film. Digital cameras are too limiting for the type of photography I do.
However I have my COLOR negs scanned and printed on a Lightjet. The results are
superior to photo-optical printing (which BTW is harder and harder to find). For
b&w, I still prefer photo-optical printing PLUS the films are all so different,
right?
hope this helps-
John at photodigitalstudio dot com
The printer will print on Watercolour paper if you wish and you can get
coated canvas.
Archival print life is stated by Epson at 45 years for their semi-gloss
(under glass) and 75 years for the Archival matt.
Take that with a pinch of salt - but they're still the most economical
option for long life quality printing.
Paul W