Accessing indexed properties with more than 1 key / writing

My goal is to use the Microsoft.Office.Interop.Excel.Worksheet-class to write content straight into said worksheet(wich I have available via the Application-class).

This class uses an indexed property (Worksheet:Range) wich is used to access Cells throughout the worksheet. I've done some reading and according to what I've read, ABL doesn't support Indexed properties with more than 1 key, wich means there is no way for me to make use of this property, and  through that and what I want to achieve, the whole Worksheet-class.

Note: .NET documentation strongly recommends that any indexed property should only be
created with one key for the indexer, and this is how all indexed properties are defined
for the Microsoft .NET Framework. However, it is possible that other third-party .NET
classes could define indexed properties with two or more keys for the indexer, in which
case you cannot access those indexed properties in ABL.

I've also read on some Microsoft documentation about accessing the Range-property, and the preffered way to do it nowadays is by accessing it with () instead of [], to make it more "C#-friendly". This is something that OpenEdge ABL apparently refuses to work with, it just nags about Range-method not being found.

My attempts on accesing this property have been pretty desperate and I've tried a wide Range of things:

Worksheet:Range["A1"]:Formula     /* Compiles, but Range["A1"] is null/? causing a crash.*/
Worksheet:Range[0]:Formula        /* -"- */
Worksheet:Range(0):Formula        /* Syntax check: "Couldn't find element Range in class"*/
Worksheet:Range:Formula           /* Syntax check: "Indexed property can only be accessed with indexer/key in parentheses"

Edit: CTRL+S reflex posted the message, following:

My question is; Is there ANY way to access this indexed property with proper keys? What are my other options? I saw Infragistics had some Excel-class, is that something I could use? Like create a whole new XLS-file with that class, then just load that file with my excel.application-class?

Thanks in advance,