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This might be useful I use something similar for guitar pedals.
The Y cable was a bust. At least the one I tried (the first link). I could set it up so the CarPlay dongle was only getting power from a separate power adapter, but the dongle and the tablet wouldn’t negotiate a data connection. Frustrating.
I’ll be trying an inline relay next. However, a really simple low-tech solution is just putting this USB switch between the dongle and the tablet. You can manually cut power only to the dongle this way. Much better than powering off the tablet and waiting for it to reboot.
for anyone else wondering, this cable works with this keyboard as an on/off switch; just got mine today.
These are pretty heavily used with Raspberry Pi computers.
Just got the new Mixamp as well, I purchased this cable switch from amazon; will let you know if it works for my xbox
You could get a usb adapter switch to power it on and off, similar to this; still works perfectly for my xbox since July