Don't worry. The Paris Exarchate still receives Lutherans by chrismation, so you would not be concerned.
As for the Moscow Patriarchate, their decision seems inconsistent to me. Archbishop Longin of the MP has signed an agreement to recognise Lutheran baptisms in Germany. And the Lutherans here even allow gay/lesbian priests to live in Church appartments with their husbands/wives. And also, what about baptisms performed before the introduction of gay marriage?
Anyway, this whole thing seems so hypocritical to me. The canonical territory of the MP has the highest divorce rate in the world: over 70% of their flock divorce at least once in their lives. Is that not much more of a threat for the holiness of marriage than gay marriage, which will concern maybe 2% of all marriages?