WiFi WPA hex password with len=64 hex chars is not supported

[jaui]

I use for my WPA2 network a 64 char hex password. This is available in various router OS like DD-WRT, Fritz!OS and supported by Windows and Linux OS.
Using such a password resulting in an error message, that password must be 8 to 63 chars.
A change of the WPA2 router password is no option, since a lot of devices need to be reconfigured.