Wow, those are beautiful. I would think that to use them in a Europa, they would have to be designed to fit the unique Europa interior geography. Additionally, I would have to consider very carefully before I replaced seats as comfortable as the Europa seats. For all their simplicity (compared to modern seats) I have yet to sit in any car seat, at any cost, that comes close to matching the comfort of the Europa units.
I would like to see a hybrid combining the Europa seat with the bomber seat. Retain the geometry, padding, and seat bottom suspension of the Europa seat with the beautiful, exposed aluminum structure of the bomber seat. Looking cool and comfy, too.