I have found a version of the Segger tools that appears to simply offer flashing, and erasing.

https://www.segger.com/jlink-software-beta-version.html

It’s an executable that should be moved to the desktop, I guess.  When installed the icon looks like this.
Run it.
Set the Device to nRF51822_xxAA
Set the Interface to SWD
Click OK
To erase the chip press (you guessed it) Erase Chip
To program with a hex file, browse to find the hex file.

and press Program Device

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