I tried the Wera hex remix by Cram but they didn't fit my multiboard.

The pegboard hooks were far too large for my multiboard when printed and didn't fit into the holes. I cut the larger hooks off in Fusion and spliced on some original Multiboard pegboard hooks from one of the standard pegboard hook models.

Print one of each file for each set of Wera hex you'd like to hang.

UPDATE: Added new versions of the long hook for those who'd like their keys to sit a little straighter. I've added a choice of two extra files, either 1mm or 1.5mm higher to allow you to fine tune to suit your set.

This is a remix of Crams version found at https://www.printables.com/model/741408-wera-hex-plus-multiboard-pegboard