Couldn't find this part, so I made one.
Reduction to use Proxxon Micromot drills with a 20mm neck in cheap Drill Press Stand like this with 65mm mounting hole. https://www.amazon.com/NICCOO-Adjustable-Universal-Workbench-Drilling/dp/B0914QQ6GL/ref=sr_1_6?crid=K8OHHDPZM71D&keywords=drill+stand&qid=1682499149&sprefix=drill+stan%2Caps%2C208&sr=8-6
The author marked this model as their own original creation.