In some mail I received from Chris G. Demetriou, sie wrote
[...]
> (1) there are a number of unsolved problems with approaches like this.
> e.g. "how do you keep permissions the same between boots, without
> wasting a bunch of time while booting."

Solaris2 doesn't take that long to boot up if you don't do a reconfigure
(boot -r) when it boots.

> (2) you can't get rid of device nodes completely no matter what you
> do, though that's mostly irrelevant.  8-)

Yes you can.  Remove the driver.