I couldn't find a reasonable adapter online, so I made this one.
It should be printed in place without supports using PETG in the photos. I used 30% hexagonal infill, but less might do.
You may be able to increase the miter-side clamping fingers axial strength by adjusting the orientation to go lengthwise closer to parallel to the fingers, but support may be more tricky.
The fingers have a lip to grab the saw's clip indent. I tested both an 80 Lb zip tie and a wire pipe clamp. Both were satisfactory. The former has freedom to pivot, and the latter is a bit more secure.
Multiple vacuum hose ODs are included, measure the hose you want to use. Mine shown is 57mm and a perfect fit for the preferred hose, but it is too small for some of the hoses. If you have another dimension, use FreeCAD to edit adapter>Boolean>vacuum>Pad>vacuum_hose to your chosen OD (inside) and that plus 3mm (outside). The rest of the sketch should recompute from this without challenge. You may also be able to use a heat gun or hairdryer to deform the adapter to be a perfect fit for your preferred hose.
The expanding hose section includes octagonal wider sidewalls with curves to avoid stress concentration while adding rigidity.
The author marked this model as their own original creation.