How do I make `XmlSerializer` to ignore `IXmlSerializer` implementation?

Question

Based on a certain flag, I need to switch between the default XmlSerialization deserializer and IXmlSerialization interface implementation. How can I do that? E.g.

  public class SomeClass: IXmlSerializer
  { 
     //Other primitive and complex properties
     //...
     // 
    
     //Another issue is - What would be the best way to inject depencencies? 
     SomeClass(ISomeDepedency dependency)
     {
     }

     public ReadXml(XmlReader rdr)
     {
       var someValues =   dependency.GetSomeValuesFromDBForCustomSerializtion();               
     }
  }

  public static void Main(string[] args)
  {
   
   //This is filled out
   XmlReader rdr = null;

    XmlSerializer serializer = new XmlSerializer(typeof(SomeClass));
    if(useCustomSerializer)
    { 
       //use IXmlSerializer implemenation
    }
   else
   {
          //use Default Serializer
   }
   var someClass= serializer.Deserialize(rdr);
  }

I know that IXmlSerializer implementation is all or nothing. Is there any way to achieve this?