Just re-read OP, this is an SC400 pro-sumer photoprinter. Profile it right, then cross render to a regular production machine, and sure, it'd do the job for proofing (suitable CM SW required to do the job).
Print it on Epson Premium Photo Gloss, using all the available colours in the design, and the gamut will likely be outside what the service provider can do.
Print it on Epson Premium Photo Gloss, using all the available colours in the design, and the gamut will likely be outside what the service provider can do.