Rewrite laravel nova middleware to response 404 - laravel

Question

I need to return 404 instead of 403 error page when regular user try to get access for admin pages.
The Nova middleware which is responsible for this is located here /nova/src/Http/Middleware.
And looks like this:
<?php
namespace Laravel\Nova\Http\Middleware;
use Laravel\Nova\Nova;
class Authorize
{
/**
* Handle the incoming request.
*
* #param \Illuminate\Http\Request $request
* #param \Closure $next
* #return \Illuminate\Http\Response
*/
public function handle($request, $next)
{
return Nova::check($request) ? $next($request) : abort(403);
}
}
If I change here abort(403) to abort(404) -
It works fine and doing exactly what I need.
How can I extend this middleware to use it in my application. What should I do to rewrite middleware properly, in my application, so that I can do updates of Nova in future and do not rewrite this changes
What I tried:
Extend this middleware in
<?php
namespace App\Http\Middleware;
use Laravel\Nova\Nova;
class NovaAuthorize extends \Laravel\Nova\Http\Middleware\Authorize
{
/**
* Handle the incoming request.
*
* #param \Illuminate\Http\Request $request
* #param \Closure $next
* #return \Illuminate\Http\Response
*/
public function handle($request, $next)
{
return Nova::check($request) ? $next($request) : abort(404);
}
}
and add it to my middlewares
protected $middleware = [
...
\App\Http\Middleware\NovaAuthorize::class, // nova access
];
but it had no effect

Answer 1

in /app/Providers/NovaServiceProvider.php
protected function gate()
{
Gate::define('viewNova', function ($user) {
if( !$user->isAdmin() ){
abort(404);
}
return true;
});
}