Oh boy what a long discussion going on here.
I agree with @pauliunas that it should be safe as a priority and after that, you can discuss the design.
So why not take a shorter cable to the powerwall, so it doesn't get in the way with other plugs and after around 30cm go on with a cable towards our highheld device.
If! there is room to improve, add a USB-A and USB-C port to the charger - but i don't know if that would be possible.
I don't know anything about chargers though - but it would be cool if there was a switch for fast and slow loading keeping in mind that a slow charging is much better for a longer lifecycle performance of the battery due to a slow intercalation process. But sometimes you rely on a fast changing while traveling.