Hello,
I have a quite similar problem with the X735 power management board from Geekworm, which is why I found this thread. It needs an installation of scripts via apt-get to make the button work. But that is, as mentioned above, not possible in LE.
I tried this installation method for LE which unfortunately made my pi not boot anymore. But I found this topic here, which made me a little bit more optimistic to find a method to make it work. Especially because I am such a fan of LE.
Is it possible to also use the "Raspberry Pi Tools" add-on (and perhaps add some lines to any of these scripts) to make it work? As far as I know the button could work with LE, the fan with pwm however is not very likely to work.
Thank you very much in advance for your support and your work on LE!