Basing my code off of preexisting code for Mecrisp-Stellaris, I have done a port of zeptoforth to the nRF52832 even though I do not own a board with this MCU. This is largely as a stepping-stone to doing a port to the nRF52840, which I do own but for which no port for Mecrisp-Stellaris exists at this time. If my experience with the STM32L476 and the STM32F407 is any indicator, I expect the port from one Nordic Semiconductor board to another to be relatively painless, specially since they are both in the nRF52 family.