Software uart for nrf52832

[Stas]

I need second and maybe even third uart modules (for rs232). Is there any sample code like in Arduino (Software uart)?

[Stas]

The main reason why I use nrf52832 is to have ability to do OTA DFU. Because I sell my devices that can be far away from me more than 1000km. I understand use software uart for nrf52 is not good idea, so I think it's ok to use multiplexers. I've found max14830 it can work via spi or i2c and extend to 4 additional uart. But the price more in 10 times than for example very popular stm32f103 that has 3 uart and a lot of other additional futures.So my question now. Is it good decision to use other cheap mc for extend abilities of main chip(nrf52832). And one more question, can I in that case update both of my mc over air? I know most Chip's booloader support DFU via uart, but will I be able do it via i2c or spi.