This adapter plate allows the use of the large clamp base with the small arm version of the Multifunction Arm Mounting System (I didn't find one already made). It's a simple plate that uses M3 hardware to attach the smaller bits. The larger outer perimeter holes were sized for M4 on the plate. STEP files included in case people want to adjust sizing.
There are 2 versions of this file. One that aligns the smaller holes with the larger and one that rotates them 45 degrees. These should be printed with the same settings as the system as recommended in the mounting system linked below.
The Multifunction Arm Mounting System designed by @RostaP can be found here.
The author marked this model as their own original creation.