The obvious solution is just to use the K3 +12VDC output
connector for
all accessories. It's rated for 0.5A which should be
plenty for most
devices. As a bonus it's controlled by the K3 ON/OFF
switch.
That by itself doesn't cure ground loops and it doesn't cure
the negative lead damage problems if the power supply has a
ground path other than exclusively through the negative lead
to the rig, so the negative of the supply still must float
from ground everywhere except at the rig. The audio line
grounds still need isolated too if they run between gear
that is connected to power lines, like computers and such.
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