Serialising JCE secret keys ****tably

dear community,

i've been trying to figure out how people are serialising secret keys
using the JCE. seems to me that there are an awful lot of KeySpec
cl***** missing for symmetric keys. so how does it work?

originally my application used object serialisation, which works great
on any algorithm of course - but good luck serialising between VM types
and versions. 

so my application is now restriected to DES for session keys, because
it's the only algorithm sup****ted by a KeySpec class. here's the code -

serialise ()
{
      SecretKeyFactory  keyFactory = SecretKeyFactory.getInstance
         (sessionKeyAlgorithm, sessionKeyProvider);

      DESKeySpec  keySpec = (DESKeySpec) keyFactory.getKeySpec
         (inSecretKey, DESKeySpec.class);

      return keySpec.getKey ();
}

deserialise ()
{
      DESKeySpec  keySpec = new DESKeySpec (inEncodedKey);
      
      SecretKeyFactory  keyFactory = SecretKeyFactory.getInstance
         (sessionKeyAlgorithm, sessionKeyProvider);
      
      return keyFactory.generateSecret (keySpec);
}

i'd like to do the equivalent for Blowfish, but there simply isn't the
KeySpec cl***** around to do it. do i have to write my own security
provider, my own BlowFish algorithm, and my own KeySpec cl***** to do
this, or is there an easier way?

btw i evaluated RSA BSafe and they didn't have any KeySpec cl***** for
their algorithms either. they said "oh just use our API" but of course
the JCE has so many nice things going for it. just seems like this part
is a wrinkle in an otherwise solid library.

thanks for any help received,
j