How to implement Laravel Fallback Routes with Laravel Nova?

For a project we're working on right now, we have requirements to serve a couple wildcard routes from the root domain, which is a little frustrating, but I am wondering if anyone has experience with fallback routes and how to implement them?

Here is a shortened version of my routes web.php file:

/**
 * This group middleware is to ensure that users
 * have a zip code in their session.
 * If they don't, they are redirected to the zip code lookup page.
 * If they do, they are redirected to the next route.
 * 
 */
Route::middleware([CheckBrandSessionMiddleware::class])
    ->group(function () {

        /**
         * Get list of news articles for a brand.
         */
        Route::get('{brand}/news', [ArticlesController::class, 'index'])
            ->name('articles.index');


        /**
         * Get a dispute for a brand. 
         * (This must come after the news route, as this is a wildcard catch-all route.)
         */
        Route::get('{brand}/{dispute}', [DisputeController::class, 'show'])
            ->name('disputes.show');


        /**
         * This is here to ensure that requests to admin routes are accessible 
         * since we are using wildcard routes to generate routes to a brands pages.
         * 
         * We also need to ensure that this is the last route in the routes file as this will override 
         * all other routes hereafter. 
         */
        Route::get('/{brand}', [BrandController::class, 'show'])
            ->name('brands.show');
    });



Route::fallback(function ($request) {
    return "test"; // Fallback route that I want to implement. This does nothing and the 404 page is still being returned.
});