Yep, that's where Apple seems to be going. I've got a 2013 MacBook Air with 128 GB SSD which is practically impossible to update.
As for the Kensington, there are a couple of alternatives;
- Hardware: Snake~Chicago
- There's software, too: https://www.macupdate.com/app/mac/39997/plugspy
Well, good luck, it's a beast of a machine.
Thanks for showing me this. Better than nothing. Perhaps i can help you back. I can swear you can upgrade the SSD in that MBA. Check out OWC they sell a lot of apple stuff. Here is the guide on how to remove yours: https://www.ifixit.com/Guide/MacBook+Air+13-Inch+Mid+2013+Solid-State+Drive+Replacement/15181