ZF1自定义视图助手目录

I've an application running on Zend Framework 1, I've a set of view helpers located on a directory application/views/helpers and the helpers are loaded on the following code when the application is run

$view = $this->_bootstrap->bootstrap('view')->getResource('view');
    $view->addHelperPath(
        '/views/helpers',
        'Classy_View_Helper_'
    );

So current helper class name is like Classy_View_Helper_Something

Now due to a new business rule I need to have specific view helpers according to a parameter on the Zend Registry that extends from the original helper but overrides some params in functions, so, for example if my registry value is Tiny then I should look for the class Classy_View_Helper_Tiny_Something that extends from Classy_View_Helper_Something and must be located on /views/helpers/tiny

I was thinking about putting this logic in the same place for the $view variable but I can't verify for the registry value on that code.

Any idea how can I perform this modification on ZF1?