I think I was not clear. I meant, the internal forum could be used to resolve the issue of remarried-divorced CATHOLICS allowing them to receive the Eucharist regardless of canon law--which was the "impediment" you suggested was stalling formal discussion with Lutherans about inter-communion among Catholic and Lutherans. And with that issue resolved on the Catholic side, would that not provide the context German theologians require to actually begin the talks with the Lutherans?

Where I live (Canada), inter-communion is quietly practices among Catholics and Anglicans and some other Protestant denominations. Especially so at retreat houses that have Protestant and Catholic clients on retreat at the same time.