The Marvell 88W8897 is an AzureWave AW-CB178NF connected to the second m.2 key m via an adapter. I tracked this one down on the Microsoft page for Windows on ARM NXP, then got the drivers mentioned from the NXP Windows BSP. You seem to have to right click and install via the .inf, but it works fine afterwards.
I’ve included some shots with the massive ASUS Vega Strix card removed to illustrate the setup a bit more. I wanted the res and pump hidden in this build so the lines run through the back of the chassis to the res under the plastic cover for the PSU. The rad is an x-flow rad. It was a massive pain to run those lines.