@Gordon Have you seen this ESP-WROOM-32 (ESP32) programming board with spring contacts? I know the nRF52-based MDBT42Q is smaller, but I'm wondering if something similar could be made from one of these boards. I've found this one very easy to work with.
(If you Google Image Search "ESP-WROOM-32 fixture" you'll see some better images. The ESP-WROOM-32 just clicks into place and stays there until you snap it out)
Looking at mine, I think you might be able to hack the contacts off one of these and onto your own board, with a Dremel, a tiny iron, some tweezers and a lot of patience.
Edit: or, come to think of it, if you don't need the short-edge contacts, you could probably just saw out the two rows of side contacts and move them closer together!
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