Have you tried using TOUCH ID as a substitute for Power Button in the regular shortcuts?
I haven't got my hands on the new MBP but an article here says
...and when you want to turn it off, you just hold down the Touch ID button found at the rightmost side of the Touch Bar.
So technically, Touch ID is the power button.
However, according to iMore, TOUCH ID only offers following functionality:
The "Use Touch ID for" options include:
Unlocking your Mac
iTunes & App Store
So ther is slightly less chance of Touch ID working as a power button.
You can let us know about it.
Another small workaround this situation can be using
CMD+Shift+/ to open
Help menu first
And then using Direction keys (Up, Down, Left & Right) to navigate to Apple Menu, from where you can easily