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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
ccchan
Yes, for that get two (it is <$2 item after all) and flash one with another. But you can also buy DAP dongle directly, search aliexpress for "daplink". Just beware, the cheapest ones are based on WCH549 chip which is 8051 family and while it works it is quite slow, better get one with arm chip inside.
If you get that stlink V2 dongle I have a build of CMSIS-DAP that enables also UART over SWIM/RST pins. And BTW you can even run stripped down Espruino directly on stlink https://github.com/fanoush/EspruinoBoards/tree/master/STLINKV2
You can also use Raspberry Pico with picoprobe FW.
And BTW in theory you can now unlock nrf52 even with original stlink firmware, recently there was
stlink-dap.cfgadded to openocd which exposes lower level DAP interface of stlink https://review.openocd.org/c/openocd/+/4904/9/tcl/interface/stlink-dap.cfg so the commands for unlocking are there. For some reason it did nothing when I tried but it may work for you.