I myself have the littlites too and always hated to use an extra power adapter.
Most keyboards have a built-in transformer to convert main-voltage to 12VAC. So I used this (mostly over dimensioned) AC power to feed my littlites thru a special 4 pin(!) XLR connector.
The XLR chassis-part is located in the small metal plate that is reserved for the video-interface.... so no 'damage' to the SD1's body.
The littlites are variable and are mounted at the backside of the SD1 music stand.