In 13inch rolls, paper availability is scarce to say the least.
I don't know any baryta-like paper, only RC and a few matte ones (Hahnemuhle Photo Rag 188 and Moab Entrada).
I've heard of cutting rolls on this forum, but never tried.
Additionally, if the R3000 is like my old R2400, it only support 2" diameter roll cores; which means you still have a problem if you cut down a 17" roll, since most of them are on 3" cores.
I've printed from 3" cores papers (10" and 13" inches width) on my R1800 (RIP) - it's not that a big deal with any support for the roll and careful alignment at paper feeding.