C# Get Text from Larger Text

Below is an example C# code to put in Content to a paragraph.

            InsertionPoint ip = textFrame.ParentStory.InsertionPoints[-1];
            ip.Contents = "This is an InDesign Table conversion test: Header1\tHeader2\rCell1\tCell2";
            Text text = ip.Texts.FirstItem();

What I want to figure out is how would I extract the right part of the text starting after the ":"?
I want to extract it as a "Text" object, or any other compatible object so I could use the function "ConvertToTable".
i.e:

Text subText = ...//Somehow get the the text after the ":"
Table aTable = subText.ConvertToTable("\t", "\r");

So using C# text.ItemByRange(x,x) doesn't really work since it returns a InDesign "Objects" in C#, which is basically an array.
The "Objects" doesn't have a "ConvertToTable" method.

The "Objects" class has below properties and methods:

Doesn't seem like there's a way to convert a collection of "Objects" to a "Text" object.
I've tried to convert "Objects" to "Text" as the following, but it fails on me:

Objects objects = text.Characters.ItemByRange(43, -1);
Text subText = (Text)objects;