I have a SIP 01923 Dust and Chip Collector and a Triton Planer/Thicknesser (UK) and wanted them to make out.
The DC has an existing adapter down to 70mm, and the external diameter of the Thicknesser is 53.5mm, so this bridges the gap.
No supports are needed.
There is a loose interference fit between the adapter and both machines, some painter's tape will tighten it up if needed.
The author marked this model as their own original creation.