Obaminator: interesting, but lets give a hypothetical (and your post was the first that I hear of this, so I have no negius one way or the other).
Imagine a couple, one side jewish, the other not really. If the halachic geirus of one side is an impediment to the other becoming a ba’al or ba’alas teshuva, should one push that both husband and wife should be miskarev, and a real geirus may have to be done to one side at a later date? Once again, your post just raised the idea, I had not thought about the issue before.