I would recommend trying it without linux emulation first. I recall @wblock mentioned he used an epson printer for color photos, perhaps he uses this same driver. I crossed checked the OpenBSD/NetBSD sites and they do not have this driver. Looking at the pkg-plist for print/epson-inkjet-printer-escpr, there are two libexec files libexec/cups/filter/epson-escpr
These appear to have compiled in FreeBSD.
Ideally, if linux emulation is required, it should have been, IMHO, included in the port. The porter copied the description directly from the Seiko-Epson site and if the port does not require emulation, it would, could, should have been noted in the description.