Yes quite a few stack these reducers for live imaging - have a look on cloudynights EAA forum. Just a matter of getting camera-reducer-reducer spacings right. They work them down to x0.33 or so.
They often do it as the 3.3 reducers are hard to come by
But I'm amazed you get it to work OK as most use them with 1/2" or smaller 1/3" sensors.
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