CNAME and IPv6

[Peter]

Hello,

  if I understand corrently, the use of CNAME is just a convenience
and no technical feature, right?

In lots of examples on the net, a zonefile for a domain might contain
things similar to this:

  @ORIGIN example.com.
  ..
  myhost 	       A	1.2.3.4
  www	       	       CNAME	myhost.example.com.
  www1	       	       CNAME	myhost.example.com.
  someapp	       CNAME	myhost.example.com.
  xyz	       	       CNAME	myhost.example.com.
  ...

Often, the webserver and other applications are not actually
running on node 1.2.3.4, but are internally portforwarded to
some other node, for various reasons.

Now we add an IPv6 address for 'myhost'. But portforwarding
doesn't work for IPv6. Instead we are required to use different
addresses all over, like so:

NOT CORRECT:
  myhost 	       A	1.2.3.4
  myhost	       AAAA	4321::1
  www	       	       CNAME	myhost.example.com.
  www	       	       AAAA	4321::10
  ...

Or, NOT CORRECT:
  myhost 	       A	1.2.3.4
  myhost	       AAAA	4321::1
  internal	       AAAA	4321::10
  www	       	       CNAME4	myhost.example.com.
  www	       	       CNAME6	internal.example.com.
  ...

So, how would you do it? Is there a nice and elegant way?