If the mini 9 doesn't support WOL you can still use the miniSpark's (when we're ready to sell ) Output Drivers as an ACPI switch trigger. This of course would mean you have to hack into the mini and connect to it's ACPI port.
WOL is the major feature of miniSpark but we wanted to maintain an ACPI solution for just this kind of setup. You will still be able to configure the StartUp & Shutdown delays thru our APP GUI.
Hope this helps.