Here's an alternative to wrapping GPG, using .gnupg/gpg.conf:

  personal-cipher-preferences AES256 AES
  personal-digest-preferences SHA256 SHA512
  personal-compress-preferences Uncompressed
  default-preference-list SHA256 SHA512 AES256 AES Uncompressed
  
  cert-digest-algo SHA256
  
  s2k-cipher-algo AES256
  s2k-digest-algo SHA256
  s2k-mode 3
  s2k-count 65011712
  
  disable-cipher-algo 3DES
  weak-digest SHA1
  force-mdc

Note that these options impact compatibility with other GPG/PGP clients.