I tried all manner of magnets, extensions, etc, but I couldn't even get the nut started, let alone turning. It didn't help that it was a nylon lock nut. I switched to a serrated flange nut, and came at it from a different angle. By standing in front of the snorkel, and reaching back and down with my right hand (I'm a lefty so this wasn't fun either, plus our elbows only bend one way LOL), and going above the snorkel elbow instead of below, I was just able to reach the stud with my finger tips. After numerous attempts, I got the damned thing started.
Now I needed to get it tightened. I tried a 1/4" socket taped to a 24" bar, but there just wasn't room to turn it. Sometimes I'd get one click, but usually nothing. After some more frustration, I somehow manhandled a ratcheting 12mm wrench into the space, and was able to tighten it down properly, using my fingertips. Whew.
Okay, now I needed to fit the airbox connection. I began by completely removing the "boomtube" (because nobody likes an intake noise diffuser).

Then I put the new connection hose in place with silicone under the rubber seals under the clamps on either end, just in case. The a-pillar mount came with rivets, which I substituted for nut-serts, drilled two more holes, and tightened the last two bolts.
Finally, I hooked up and snapped the fender indicator into its new home, and stood back to survey the damage... err... I mean... Finished product.
Its so low profile that I can't actually see it from the (RHS) driver's seat unless I lean forward. And any new intake noise is nullified by the compression ignition engine. ?