Hello.  It looks like the ukbd driver only allows 8 modifier keys on
the keyboard, although the comment says it's 32 keys.
sys/dev/usb/ukbd.c:87 says: #define MAXMOD 8         /* max 32 */
Assuming the comment is correct, it looks like a change from 8 to 16 would
allow for up to 64 modifier keys.
A quick trip through this file suggests that this is a pretty harmless
change and might just fix your problem.
So, I suggest changing the above line to:
#define MAXMOD 16         /* max 64 */

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