So, Aimless has been "out in the wild" for a while now, and works well. It has been supported for a while in xia2, but I intend to make this the default in the next release (which I plan for the end of the week.)
This will mean it needs a relatively recent CCP4 installation (i.e. 6.3.x) which should not present a problem.
As always, any problems with this please shout.