Convert "Sign Only" Primary Key

[Klaus Fuerstberger]

Hi,

a time ago I created a "Sign Only" DSA Key with an ElGamal Encrypt
Subkey. Now I noticed that it is not possible to encrypt a message with
PGP to this Public Key because PGP only sees the "sign only" primary Key
and not the encrypting subkey.

Ist there a possibility to convert the "Sign Only" primary Key to a
"Sign and Encrypt" Key?

Any other possibilitys to use this Key, so it is compatible with PGP?

Many thanks for Your help!

Bye,
Klaus