Likely a pipe dream, but I have not done an exhausted search.
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The first hurdle is the fact that you have a bike with a 27.2mm seat post diameter. That immediately limits your options.
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I am also not aware of any dropper that uses a Di2 integration in any form. There are only two electronic droppers I know, and they fail to meet your size and wireless Di2 integration goal.
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I don’t know if any dropper (wireless or external wired, since you can’t do a bottom run internal and still fit the battery) has any Di2 battery mount option.
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Here are just a few 27.2mm size options that have external routing (some offer different drop lengths too). But again, you may also have issues with drop distance on some, depending on how much post extension you have for your saddle height.
- KS eTEN-r Dropper Seatpost - 27.2mm, 100mm, Black MPN: ETENR 27.2 | Worldwide Cyclery
- https://www.worldwidecyclery.com/collections/dropper-seatpost/products/pnw-pine-cx-external-route-dropper-post-110mm-travel-27-2mm-cx-lever
- KS LEV Dropper Seatpost - 27.2mm, 100mm, Black MPN: 2020 LEV 27.2 100 | Worldwide Cyclery