Extending dgrid formatters

I'm looking for ways to improve experience for editors by adding some more information into the block search reusults or the tooltip:

I've explored a lot of files, and I think what I have to do is to add or override default formatter to \epi_modules\CMS\11.24.1\ClientResources\epi-cms\dgrid\formatters. Haven't found much resources.

What I tried so far:

1. Copied ClientResources\epi-cms\dgrid\formatters.js.uncompressed.js to \ClientResources\Scripts\AlloyFormatters.js
2. Created Initializer.js file:
   

   define(["dojo",'dojo/_base/declare',
       // Parent class'epi/_Module',
       // Commands'alloy/AlloyFormatters'
   ], function (
       // Dojo
       dojo,
       declare,
       // Parent class
       _Module,
       AlloyFormatters
   ) {
       return declare([_Module], {
           initialize: function () {
               this.inherited(arguments);
           }
       });
   });​

3. Updated module config to initialize my module after Shell and CMS:
   

   <?xml version="1.0" encoding="utf-8"?><module><assemblies><!-- This adds the Alloy template assembly to the "default module" --><add assembly="AlloyDemo" /></assemblies><clientResources><add name="epi-cms.widgets.base" path="Styles/Styles.css" resourceType="Style"/></clientResources><clientModule initializer="alloy.Initializer"><moduleDependencies><add dependency="Shell" type="RunAfter" /><add dependency="CMS" type="RunAfter" /></moduleDependencies></clientModule><dojo><!-- Add a mapping from alloy to ~/ClientResources/Scripts to the dojo loader configuration --><paths><add name="alloy" path="Scripts" /></paths></dojo></module>​

What I observe in when I debug the code is following:

1. Default formatters register, by calling Formatter.addFormatter() method:
   
2. My module is initialized, and calls method Formatter.addFormatter("contentItem", module.contentItemFactory, true); effectively overriding default implementation provided by default modules:
   
   
3. However, when I type something in the block search field, and break in the JS, the formatter that is being picked is always the default one:
   

As you can see, it's the default implementation of contentItem formatter resolved, and not mine from AlloyFormatters.

As I'm no dojo-expert, I feel like I'm missing something very simple.