You can use another system to install the hax on PSMD. I know because I have done this.I thought you could use SMDhax with another system to install it? Oh well... guess I wait.
And I wish I had Cube Ninja >.<
Just make sure during the installation of the hax on PMSD you select 10.7 for the payload version.
A 11.0 payload doesn't exist at the moment as far as I know. The installer will automatically select the payload version of the currently installed firmware. You can use the keypad to select another version.
And the payload for 10.7 works without problems on 11.0.
BTW: Cubic Ninja doesn't work on 11.0 too.