ADB Apple Extended Keyboard under Tiger

[vcomputer]

I have an International Apple Extended Keyboard II (german layout) connected to my macs via Griffin's iMate ADB-USB-Adaptor. Since I love its haptics, I don't want to stop using it.

My setup was running perfectly under all versions of Mac OS (Classic and X) up to 10.4.0.0. Running the Tiger first time, the "Keyboard Assistant" popped up asking what type of keyboard I was using.
Regardless of the selection, the keyboard is only partly working. Two keys are causing problems:

The [<] key (between [left shift] and [y]) will print a [^].
The [^] key (above [tab], left to [1]) has no function at all.

I was thinking of building a custom keyboard layout, but since this also changes the built-in keyboard layout this solution is far from optimal.
Running the "Keyboard Assistant" from the "Keyboard & Mouse" Control Panel, I can fix the [<] key by selecting 'ANSI' instead of (correct) ISO. But the [^] key is still rendered useless. (serious regex fun... :-/ )

Also unsuccessfully tried using the AppleADBKeyboard kext from 10.3.9 (version 237.3.3) instead of Tiger's 238.3.4.

Anyone a hint, what's changed or what Extension I could replace for a cure? Anyone still using these ol'mama keyboards?

Thanks in advance,
vcomputer