For the benefit of anyone reading this in the future looking for a replacement hanger. Vitus Energie hanger is the one you want or one of the ones from aliexpress. The hanger itself is not threaded but there is a nut which is held in place by the grub screw – this nut is threaded and it’s that that the axle threads into.
Vitus Energie: http://www.chainreactioncycles.com/vitus-replacement-derailleur-hanger-2018-/rp-prod165965 or http://www.wiggle.co.uk/vitus-replacement-derailleur-hanger-silver-energie-alloy/
Aliexpress (Trident Thrust): https://www.aliexpress.com/item/THRUST-Alloy-Rear-Derailleur-Hanger-for-Mountain-Bike-Frame-142x12mm-135x9mm-rear-axle-hanger-one-pair/32804805842.html?spm=2114.search0104.3.132.54254017qobTr8&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10151_10065_10344_10130_10068_10324_10547_10342_10325_10343_10340_10548_10341_10696_10192_10190_10084_10083_10618_10307_10820_10301_10821_10303_10059_100031_10103_10624_10623_10622_10621_10620,searchweb201603_12,ppcSwitch_5&algo_expid=6ee910a8-e905-4d9f-88bf-ea90c35be854-16&algo_pvid=6ee910a8-e905-4d9f-88bf-ea90c35be854&transAbTest=ae803_2&priceBeautifyAB=0