Dynamic instantiation of object through constant. [PHP 8.1+]

Instance.php

final class InstantiationFailure extends \LogicException implements Exception
{
    final public const NAMESPACE = __NAMESPACE__;
}

final class Instance
{
    /**
     * Create an instance of a subtype of a certain supertype.
     * 
     * @param string $subtype
     * @param string $supertype 
     * 
     * @return object 
     */
    final public static function create(string $subtype, string $supertype): object
    {
        class_alias(
            InstantiationFailure::class, 
            $exception = basename($supertype).basename(InstantiationFailure::class)
        );

        $accessor = $supertype.'::'.mb_strtoupper($subtype);
        $instance = constant($accessor) 
            ?: throw new (InstantiationFailure::NAMESPACE.$exception)($accessor);

        return new $instance;
    }
}