Open PageNotFoundContentFinder logic for other scenarios?

[nvisage-gf]

Would it be possible to make the content finder logic available publicly (extension methods maybe) to enable using from a controller (for example). We have a multi site install using Hybrid Framework route hijacking and virtual nodes with some content retrieved from external web services; we'd like to catch 404 WebExceptions returned from web service calls or HttpExceptions thrown by our controller logic in the base/abstract SurfaceController similar to this:

    protected override void OnException(ExceptionContext filterContext)
    {
        // Bail if we can't do anything; app will crash.
        if (filterContext == null)
        {
            return;
        }

        if (filterContext.ExceptionHandled)
        {
            return;
        }

        var ex = filterContext.Exception ?? new ApplicationException("No further information exists.");

        if (ex.IsNotFound())   // IsNotFound checks WebException or HttpException for 404 status
        {
            // handle this as a 404 using closest not found page for request
            var notFoundPage = PageNotFoundContentFinder.NotFoundPage(UmbracoContext.Current.PublishedContentRequest);
            var model = ModelLogic.CreateMasterModel(notFoundPage) as MasterModel<NotFound>;
            filterContext.Result = View("NotFound", model);
            filterContext.HttpContext.Response.StatusCode = (int) HttpStatusCode.NotFound;
            filterContext.ExceptionHandled = true;
        }
        else
        {
            // Log the exception.
        }
    }

We have this working using modified code for review/comment (probably should use helper / extension methods)?