Unfortunately, I haven't found it in the range (yet), but you could contact customer support and ask whether the product can be included. :-) Would certainly make a few people happy!

the German version has kind of a boxy design (with simple ornaments and icons in the 4 corners) plus "Exploding Kittens" written in the middle - I'd assume it matches the back of the German extension pack...

Do you mean the following?: Art. "12009102": Asmodée Imploding Kittens Art. "10024722": Asmodée Exploding Kittens NSFW Edition

Google search revealed that only the motifs differ. I still have the NSFW edition lying around at home and will unpack it today or tomorrow. hrhrhr Will let you know then if there are any other notable differences.

Unfortunately, we no longer have a source of supply for the English version, sorry.