stupid question - how do I change a MAC address on an Aironet 350 client card?

This is potentially a very stupid question, but here it is anyway. How
do I change a factory MAC address on a Cisco Aironet 350 series PC
Card adapter? The ACU help recommends not to change the factory-set
MAC address and the statistics windows in ACU shows my current MAC as
'factory'. All of this suggests that a "non-factory" setting for the
MAC is somehow possible (though not recommended by Cisco), but I don't
seem to be able to find a position where I can edit it in either the
ACU or the properties tab for the adapter in Windows device manager.

I use the ACU version 6.3.011, which appears to be the latest one at
the moment. Should I be using some software other than ACU/older
version thereof? Unfortunetely, I don't have a machine that runs Linux
and has a PC card slot (i.e. Linux laptop of some sort) so I'd much
prefer a solution that works on Windows this time around.

Thanks a lot,
Andrei