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Consubstution is not the official Lutheran definition of what happens to the bread and wine at communion, neither is transubstution.

Orthodox Lutherans believe that during the consecration, the bread and the wine become the Body and Blood of Jesus, even though the appearance and properties of the bread and wine are still there. How this happens is not precisely defined.

Consubstution (Body and Blood in and bread and wine) is of Anglican theology. Lutherans often are labeled as holding to consubstution, when in actuality they are closer to the Eastern Orthodox view of communion.

As for communing in a Roman Catholic church, in short no. Taking communion shows that you agree with the theology and discipline of the church offering communion. To do that regularly at a church where you are not a member would be misleading. I know that the ELCA practice open communion, but that is something that is on pretty shaky ground theologically.

How ever, in extreme situations, ie near death or facing good possibility of death, it is allowed.