Maybe you misunderstood me.
The deployment packaging would create a highly customized version of ext-custom.css and ext-custom.js that only included what you needed (for example if you didn't use a tree or a grid it wouldn't include those packages). It would also create a special version of resources with the proper images. It would also package together all of your application files into a single file called application.js.
You would then copy this clientdeploy/ folder into your php app and include the following:
<link rel="stylesheet" href="clientdeploy/resources/css/ext-custom.css" />
And your client deploy would look something like this: