Hi Wayne,
I have finished testing the HID mouse remote wakeup demo on FRDM-KL43 board. Attached the demo project in IAR.
Before you run the demo, please make sure you have enabled USB wakeup support in PC BIOS. Also you need to plug in AC power with your laptop, otherwise you will not be able to wakeup laptop with HID mouse. See below image for example.

When you run the demo, you will see console output as follows first and HID mouse detected on PC and it circles in one square.
USB device HID mouse demo
When you close your laptop lid, you will see PC suspended and console output as follows.
USB device remote wakeup state: 1
USB device start suspend
USB device suspended.
Please Press 'SW3' to remote wakeup the host.
When you press SW3 on FRDM-KL43 board, you will see console output as follows and PC waking up by HID mouse.
Remote wakeup the host.
USB device start resume
USB device resumed.
USB device remote wakeup state: 0
Finally please note you need to power OPENSDA USB port to another PC which does not suspend at all, otherwise the board will be removed power when the laptop suspends
Hao