I've found a lot of artists and galleries are wanting a mix of printed, mounted, framed images along with a desire for BIG prints. In the past I've run these on IJM528 from Canon, with a laminate - creates a photographic print. Still printing a show that opens tomorrow for a gallery whose walls are deep ink blue, so the vinyl isn't an option. Bought in, calibrated and profiled some Phototex opaque, which completely hides the blue (and bright white of filler). Makes a simple option for creating a wall of image, that a competent person can hang. Largest pieces were 80"x120" and 120"x72", with internal corners and power sockets.
Phototex here is around £20/sqm, inkload is low to mid, but goes out the door at around 5x that. You've got a high speed R2R machine, where as I'm looking at around 3-4 sqm/h in high quality production on an 8400, and I'm cutting off each panel as I go.
Get a roll of Phototex in to try - I think the rep for them posted recently over on S101 about sending out test rolls - I'd say this is a product that some of your custers are pre-qualified for.
Tail end of the year, we're moving to a new and larger premises, and the 80600 is still on my list of maybes.