Well, if it were me, I'd be looking at using maybe 'Nancy' to add a WebGUI to my app - obviously there's a lot of ifs/buts/whens etc to consider, but for example, it means you dont need to deploy an IIS component, because you can go the Nancy 'Self Hosted' route and it will supply the HTTPx backend for you
Take a look at
Build Simple Web UIs with the Nancy Framework -- Visual Studio Magazine[
^] and see if it looks like it might cover your case