Unfortunately, that is not currently possible.
In the meantime, I would suggest plugging-in the fare basis (shown by the KVS Tool) into the ITA engine using the following special syntax to see [at least some of] the possible routings:
Code:
From: ::/ F YY..FBASIS
To: ::/ F YY..FBASIS
For best results, click on [More Options] and UnCheck the [Check seat availability] option.
Does this mean that routing rules will not be coming back to KVS any time soon?