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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-
Do you have access to a 3D printer? Seems like an ideal job for one
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If the Axminster one is the right size at the big end, you could chop the small end off and epoxy a correctly sized piece of PVC in its place. You should be able to file/sand it until smooth to maintain good airflow and eliminate ridges etc. Curious to see what you go for. I love bodging wee fixes, but your standards are clearly higher than mine!
Bobbo
Nef
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.