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Dammit-
Used for brakes on competition cars too. Endurance race cars tend to have dry-break couplings in the brake lines so that if the team has to replace a corner of the car (i.e. suspension, upright, hub and brakes) they can just remove the old one, attach the new one which is already pre-bled, and off you go. Saves having to remove the caliper before switching out the suspension and then refit it once the new suspension's in place.
Audi definitely used them on a lot of fluid lines when they had their incrediballs system for replacing the whole of the back end of the car in a few minutes at Le Mans.
Brommers
I was under the impression that most dry break systems like these (I think sram also had one for a while as well) were ok for splitting the hose but then the brake still required a re-bleed afterwards? I think there are some that are air-tight in order to avoid this but they end up being quite a bit bigger such as No.22 brake-break system
and SJS had one for sale which came from a motorsports manufacturer? https://www.sjscycles.co.uk/brakes/100-dry-hydraulic-coupling-fittings-no-hose-supplied/?geoc=CH.
I also remember a small taiwanese company Zeno who were developing a product called speedlink that did the same thing.
Either way I don't imagine you could squezze any of the bigger connectors into the headtube or stem of an a fully integrated cockpit.