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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.
Nef-
Thanks. I hadn't considered making one out of wood. I don't have a lump big enough but I could laminate some offcuts of mdf together I guess. It needs to sit inside the 100mm hose as its of the flexible variety. I do want it to sit outside of the dust port in the table saw though, to avoid a ridge in the flowline, so that axminster linked one won't fit the bill unfortunately.
Hovis
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.