solaris 11 installadm profiles, and sparc

I've been playing with the new installer stuff in Solaris 11.
I'm very used to jumpstart. it seems there's kinda some gaps in the new stuff :(

my workflow has previously been:

1. Create a jumpstart profile, to layout disks,etc.
2. Create an entry in the "rules" file referencing the profile
3. Use WANBOOT. Which defines the hostname in the network-boot-arguments

This worked great.
However, in the "new world order", one is supposed to create base profiles using the sysconfig tool?
Which insists on setting the hostname in the profile.

If I want to recreate the above workflow, am I expected to hand-delete the hostname thingie from the xml output?
Or is there some "better way"?

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