I have a P600 which accepts 13 inch rolls, but here in New Zealand, availability of good papers is limited.
I have bought some 17 and 24 inch rolls of paper I like (Ilford Gallerie Smooth Pearl and Epson Cold Press Natural) for (1) panoramas wider than 19 inches and, (2) frankly to save money.
However, I have found cutting the roll paper into sheets to be more hassle than its worth if the objective is simply to save money.
Neither of these papers flatten well between MDF sheets left for a month with a 20kg weight on top.
I've made myself a de-roller somewhat like this:
https://www.bhphotovideo.com/c/product/485915-REG/Seal_Bienfang_SEDR15024_De_Roller_Model_SEDR15024.html This works better, but the leading edge of the paper produces an indentation on the paper about 6 inches down (the circumference of the roll), no matter how tight I roll the paper. However, there is nothing visible in the print once mounted.
Even after using the de-roller, I struggle to get the paper to feed properly usng the sheet feeder (even the Ilford Smooth Pearl which is meant to be okay for the sheet feeder) - the intake roller usually chews up the paper. I have much more success using the front fine art feeder. However, I need to ensure that the leading edge has a slight curl upwards or it won't slide into the feeder.