As it happens, I emailed a place recently in relation to having stainless steel splashbacks and upstand made for my new kitchen. This is the reply I received:
"Further to your email of 30th inst. we regret that we do not make stainless steel splashbacks and upstands, however you could contact Larry or Mark at Dublin Steel Pressings Ph:01-4260080 and they may be able to help you with your enquiry."
I haven't followed up on it yet, but you could give them a try, and maybe post on this thread if they're any use? Or if I get to them first I'll update, but I don't think I'll have time in the next few days.