I actually wrote a replacement for the SDK tool OleView (afaik it doesn't support calling methods only enumerating) unimaginatively called OleViewDotNet. You can get the source code here but as you'd need to compile it's likely it would be quicker to write the simple C# program or use Powershell.
What it does do is expose IDispatch methods (and some native interfaces) via a GUI so you can call them and it also provides an IronPython script window. You'd need to find your COM object by looking under "Registry -> CLSID By Name", find the entry (the filter can be used to select by name part) right click and select "Create Instance" that should show up a window similar to:
then select the "Operations" menu at the bottom and choose "Open Dispatch" to get the method/property window.
There's a lot more you can do with this but that's a simple overview.
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