I found this example for apache2:
SSLCipherSuite 
@SECLEVEL=2:kEECDH:kRSA:kEDH:kPSK:kDHEPSK:kECDHEPSK:-aDSS:-3DES:!DES:!RC4:!RC2:!IDEA:-SEED:!eNULL:!aNULL:!MD5:-SHA384:-CAMELLIA:-ARIA:-AESCCM8

Which reads similar to the default haproxy config:
ssl-default-bind-ciphers 
ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS

now modified to
ssl-default-bind-ciphers 
@SECLEVEL=0:ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS

But even that (along all the other combinations that felt even less 
appropriate) worked.
I always get the 2048 bit key now :-/


haproxy IRC replied (thanks) in the meantime and suggested [1] so I'm
giving that a try now ...

[1]: https://cbonte.github.io/haproxy-dconv/1.7/configuration.html#3.1
-ssl-dh-param-file

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https://bugs.launchpad.net/bugs/1841936

Title:
  Rebuild haproxy with openssl 1.1.1 will change features (bionic)

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