Just a quick update on the cheap board. What's below is 1.7" x 0.75" - every pin is brought out basically in the order they are on the chip, except for the JTAG pins which are on a TC2030 tag-connect on-board header. There'll be (unpopulated) pads for 8Mhz and 32kHz oscillators, and it looks like there's also space to stick pads for a voltage regulator on too.
Part of me thinks that tag-connect could be really nice. Not only can it do SWD/JTAG in a totally standard way (so you can do proper C development if you want to), but this chip has a UART on there too, so you could get access to the console over it using an FTDI dongle if you wanted a simple plug + go option.
Cables are $35 from their site - it's not cheap, but I don't know of anything else that could be used.
So other improvements:
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