kickstandsup
Why not?
German pharmacies can supposedly turn a US CDC card vax record into a digital QR code EU Covid Pass.
For those storing a bike with Stefan in Heidelberg, there appear to be 3 pharmacies within 1 km that can do this, although I have not yet tried.

Local pharmacies offer transcription of CDC vaccine cards into EU digital standard
The primary means of verifying COVID-19 vaccination status is now digital, and community members can quickly and easily digitize their CDC Vaccination Record cards into the EU standard by visiting a participating German pharmacy.Read More
www.stuttgartcitizen.com
For those storing a bike with Stefan in Heidelberg, there appear to be 3 pharmacies within 1 km that can do this, although I have not yet tried.