You can exchange the OCIODisplay node with the OCIOColorSpaceTransform node there.
That is not advisable because pressing 1 to connect to the viewer has been standardized for a long time and changing that would cause confusion. It should just be updated to work like Nuke.
We could make it so that the Viewer node has OCIO settings so that the OCIODisplay node is not needed in this specific scenario. In my opinion, that would be a much better solution but I’m not a developer so I can’t say whether that’s doable or not. It doesn’t sound like it would break things, though.