Halftone film in odd size

I´m in need of a excellent halftone film for Gum Bichromate. Now I use Agfa P3p which is a film with thick emulsion and very nice to work with. The problem is that I need a much larger film preferebly on roll but otherwice at least 40x50 centimeter or even better 50x60 cm (don´t know in inch). Not interested in spitting a 50X60cm picture in 4-6 standard negatives.
Does anybody know?
Best regard Eva

MACO Genius is made in 50.8x61cm - or at least that was the largest size I could find on www.monochrom.com. It can also be had in 10m rolls, either 50.8cm or 102cm wide.

Is that big enough?