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What is it based on? I'd base it on the Shark going southbound, but pick up the route near Brasted after going along the north downs looking for hills. Then go over beachy head at the end if you need a bit more. Challenge will be keeping the distance down to 100km.
I did this the other week as a hilly way to Brasted. Obvs you can ignore the first bit as flat. And ignore after 84km.
https://ridewithgps.com/routes/37485446
Actually that is the problem, that you are already up to 84km by the time you hit the M25. But it's a good hilly route if you want one for another day, and you can keep going with more hills further East too. Maybe head for Ide Hill and the Shark route after 67km might work better?
Most of this ^ route is based off a 200k 3.75AAA route cut in half. Nothing I do seems lumpy enough.