I was mistaken. I confused sinks and profiles. With $CARD, withe A52
profile does appear in the Hardware tab in the Sound preferences, so a
suitable .asoundrc is:

pcm.a52 {
   @args [CARD]
   @args.CARD {
       type string
   }
   type rate
   slave {
       pcm {
           type a52
           bitrate 448
           channels 6
           card $CARD
       }
       rate 48000 #required somehow, otherwise nothing happens in PulseAudio
   }
}

-- 
Pulseaudio fails with Alsa a52 (ac3) plugin (Ubuntu 10.04 Lucid)
https://bugs.launchpad.net/bugs/348353
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