Ok, so this is interesting. I have the Bontrager Integrated light on my Domane, so I could just mount the varia there and the light using the seat post mount it came with.
https://www.shapeways.com/product/LN...li=marketplace
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Brian | 2023 Trek Domane SLR 7 AXS | 2023 Trek CheckPoint SL 7 AXS | 2016 Trek Emonda ALR | 2022 Trek FX Sport 5
you should learn to embrace change, and mock it's failings every step of the way.