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TGVs all have different bike rules. You can take whole bikes on some but you can go up to 120cm on any in a bag/box - which would mean both wheels out but nothing worse.
See here. https://www.freewheelingfrance.com/planning-a-trip/bikes-and-french-trains.html
"Bagged or boxed bikes on TGVs: Bikes can travel free of charge on all TGVs if they are bagged or boxed. You simply place your bagged/boxed bike in the luggage area as you would a suitcase. The size limit for bagged/boxed bikes is 120cm x 90cm but I've never heard of anyone's bag being measured or anyone being stopped for an oversized bag."
Kinky.
What's the story on the other side though - getting to Germany from Calais I guess you just train to Paris and it's a similar trip as before.
There's TGVs but I wonder if there's an intercity route so again, no bike deconstruction.