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Edit: After re-reading your post, why don't you make a small adapter using the method I describe below for the hose to tablesaw. Although buying a 65 and 63mm holesaw may end up being a bit spendy.
Might be tricky with such a big step up, but my go to for making adapters is finding a big enough piece of timber and simply cutting holes to half depth on either side. Will require chiselling out the 100mm hole in your case as I don't imagine the cut piece will come loose on its own. Failing that, see if you can get any PVC pipe reducers.
In fact, a quick google has given me this.
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100mm is older cast iron soil pipe width in France and I bougt a 100mm to 40 adaptor. Would something like this work
Anyone have any tricks to make dust extraction port adapters? My table saws outlet port has a outer diameter of 65mm. I have a 100mm hose from my extractor I'd like to connect to it. I cant find an off the shelf adapter that has an internal diameter of 65mm to slot over it. I used to have one that had an ID of 62mm which I filed out the inside of but it got so thin it just split and fell off the other day and mdf dust got blown out all over the fucking place.