F5 APM Keymap change from default en-us to en-gb

I need your help to modify keymap for APM Thin client users. SSL VPN user able to login Thin client and successfully able to login use RDP. But keyboard looking like default en-us. Unable to choose | pipe and / backslash. Please advise the best way to change Keymap to en-gb.

 

Thank you. Best regards, Raja G