Hi there, you could try mounting to dibond or any aluminum composite material (ACM) it is commonly used in signage and makes for a nice, contemporary finish. There are a few threads on mounting to dibond/acm here on the forum, just do a quick search.
Local sign shop or franchise like sign-o-rama or quicksigns have all the equipment and materal. You could get a quote from them for mounting (the image that you provide) on to the dibond, then laminating the front surface of the image (if desired) for protection from scratching, moisture, etc...
added: And of course, there are also a number of members on the forum that will provide you w a quote