But I wonder if the kit adapts the calliper so that the bleed nipple is on the top?
Depends on caliper design but it's sometimes possible to swap the balance pipe between caliper halves and bleed nipples end to end as threads are usually the same.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone