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4700 pull ratio as 11 5800, 6800, 7000, 8000 and Dura Ace 11.
Running 11 speed with 4700 mechs is fine, done it lots. (same goes for GRX 400 mechs and chainset, my gravel has these with Ultegra 11 levers and cassette).
If ones back wheel can take an 11 speed cassette (most today) then a simple cassette, chain and r/h lever gives you it all. Also 11 speed chain makes 10 speed Tiagra much nicer and they are cheaper. -
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Cheap at SJS if it helps
https://www.sjscycles.co.uk/brake-levers/shimano-ultegra-st6800-bracket-covers-black-y00e98080/