How can I add custom method for MagentoEmailModelAbstractTemplate?

I need to replace the method of getting the link this.getURL() with my custom method this.customMethod() in the confirmation email of the user during registration.

I have created a module:

registration.php

<?php
    MagentoFrameworkComponentComponentRegistrar::register(
        MagentoFrameworkComponentComponentRegistrar::MODULE,
        'MyModules_Email',
        __DIR__
    );

etc/module.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
    <preference for="MagentoEmailModelAbstractTemplate" type="MyModulesEmailModelTest" />
</config>

etc/di.xml

<?xml version="1.0"?>
  <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="MyModules_Email" setup_version="0.0.1">
        <sequence>
            <module name="Magento_Email"/>
        </sequence>
    </module>
</config>

Model/Test.php

<?php
    namespace MyModulesEmailModel;

    use MagentoStoreModelStore;

     abstract class Test extends MagentoEmailModelAbstractTemplate
     {
         public function getUrlToStorefront(Store $store, $route = '', $params = [])
         {
             return 'test';
         }
     }

But when I try to use my method in a letter template, nothing happens, it doesn’t work, how can I fix this problem?