I haven't had a chance to revisit the issue after my initial post, but some of the replies since my last attempt look hopeful. After failing to get any PCIe car

I haven't had a chance to revisit the issue after my initial post, but some of the replies since my last attempt look hopeful. After failing to get any PCIe card to work, I've just been using an Ubiquity AP-AC Lite and called it good. Given the cheap barrier to entry for the boards, it's probably worth another try with a later revision, particularly given that the espressobin can follow mainline fixes rapidly. If I do make any progress on that front, I'll certainly update the forum topic/any blog posts.