It wont be possible at this moment for several reasons(unless you have an SIO keyboard)
The PSP slim obviously does NOT have an iR port(research would have you provided that to you instantly)
The PSP slim does not run the 1.5 kernel very well(as of this moment there is no 1.50 kernel addon for the slim) and the PiKey engine was made for the 1.50 kernel handlers
Please at least try to do further research before posting again.
