I'm looking for guidance on how to change the Razor view location order in an Umbraco 9.3 solution.

My goal is to have the web application prioritise .cshtml view files located in the ~/Foo/ directory. So far, I've only been able to add this folder to the end of the view location order.

Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Umbraco.Cms.Core.DependencyInjection;
using Umbraco.Extensions;

namespace Umbraco.Templates.Site
{
    public class Startup
    {
        private readonly IWebHostEnvironment _env;
        private readonly IConfiguration _config;

        public Startup(IWebHostEnvironment webHostEnvironment, IConfiguration config)
        {
            _env = webHostEnvironment;
            _config = config;
        }

        public void ConfigureServices(IServiceCollection services)
        {
            // Configure the custom view location order
            services.ConfigureOptions<CustomRenderRazorViewEngineOptionsSetup>();

            services.AddUmbraco(_env, _config)
                .AddBackOffice()
                .AddWebsite()
                .AddComposers()
                .Build();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseUmbraco()
                .WithMiddleware(u =>
                {
                    u.UseBackOffice();
                    u.UseWebsite();
                })
                .WithEndpoints(u =>
                {
                    u.UseInstallerEndpoints();
                    u.UseBackOfficeEndpoints();
                    u.UseWebsiteEndpoints();
                });
        }
    }
}

CustomRenderRazorViewEngineOptionsSetup.cs

Based on Umbraco's own RenderRazorViewEngineOptionsSetup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.Extensions.Options;

namespace Umbraco.Templates.Site
{
    /// <summary>
    /// Configure view engine locations for front-end rendering
    /// </summary>
    public class RenderRazorViewEngineOptionsSetup : IConfigureOptions<RazorViewEngineOptions>
    {
        /// <inheritdoc/>
        public void Configure(RazorViewEngineOptions options)
        {
            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            options.ViewLocationExpanders.Add(new ViewLocationExpander());
        }

        /// <summary>
        /// Expands the default view locations
        /// </summary>
        private class ViewLocationExpander : IViewLocationExpander
        {
            public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
            {
                string[] umbViewLocations = new string[]
                {
                    "/Foo/Views/{0}.cshtml",
                    "/Foo/Views/Shared/{0}.cshtml",
                    "/Foo/Views/Partials/{0}.cshtml",
                    "/Foo/Views/MacroPartials/{0}.cshtml",
                };

                viewLocations = umbViewLocations.Concat(viewLocations);

                return viewLocations;
            }

            // not a dynamic expander
            public void PopulateValues(ViewLocationExpanderContext context) { }
        }
    }
}

This results in the following view location order, with the default Umbraco view locations taking priority:

1. /App_Plugins/Views/
2. /App_Plugins/Views/Shared
3. /App_Plugins/Views/Partials/
4. /App_Plugins/Views/MacroPartials/
5. /Views/
6. /Views/Shared/
7. /Views/Partials/
8. /Views/MacroPartials/
9. /Foo/Views/
10. /Foo/Views/Shared/
11. /Foo/Views/Partials/
12. /Foo/Views/MacroPartials/

How can I get the four ~/Foo/ items to the top of the list of view locations?