I am already making beautiful prints on rather thin traditional Kozo on both the Z3100 and the Canon IPF8300. When doing large prints the receptor coating isn't as critical as with smaller prints, though certainly desirable if available!
The extra dmax of the Vivera inks work especially well on this kind of media. Although I can make quite decent profiles with the internal i1 spectro on the Z, I prefer to make the profiles with X-rite pro software and 2013 patches. The Z can also linearize this material internally after you have a good icc profile. I don't even use a backing sheet with it, though with this new stuff it might be a bit too thin to do that.
Back 10-12 years ago when I made my Kozo prints on Epson LF printers I always taped the large and small sheets to conventional poster board like you can buy at the supermarket or any art supply store. I used drafting tape and it worked great. However, as Walker Blackwell pointed out to me you can always turn off the vacuum on Epson printers and run a lot of the Japanese papers through them with no backing at all. He's done that for years.
John