Otherwise its pretty much just buying something off of the US again that would never go over well for the governments of the EU.

So much politics in the way of technical progress and efficiency.

The practicality questions would start with whether or not the Ozmens are interested in selling DC. They might not be. They’ve pretty much lost ISS resupply as a use case, but the DoW has expressed some prior interest in DC’s expendable Shooting Star module. Given that Sierra Space has announced intentions to pursue more military work, DC+Shooting Star could be a big piece of that.

If the Euros could buy DC, they could certainly launch it on Ariane 6. But the Euros would want to be able to build at least DC themselves and perhaps Shooting Star as well. The current supply chains for both are US-centric. The Euros would probably want all Of DC’s IP and likely the tooling as well. A lot of DC’s fabrication has been subcontracted to LockMart at Michoud. Sierra Space may not even own the tooling. That doesn’t preclude a deal, of course, but might materially complicate it.

On the brighter side, old-line primes like LockMart have decades of experience trading IP around with their Euro peers as part of co-production deals when European governments buy US weapon systems.

So never say never, but I still don’t rate the likelihood of such a deal occurring very high.