NRF52: Legacy TWI Driver not linking on SDK15 (undefined reference)


I am trying to use the Legacy TWI Driver in SDK 15. I have setup my my sdk_config.h file to remove all references to NRFX (New TWI Driver). Only enabling the "nrf_drv_twi" driver via CMSIS configuration wizard, unfortunately the linker fails to find reference to many of the TWI functions. As referenced here: ; there are quirks in associating the older legacy functions. I have also experimented with combinations of enabling the NRFX driver, enabling TWIM, enabling EASY DMA (legacy TWIM), etc. to no avail. 

Compiler Output: 

Linker Error

Here is my sdk_config.h file: 


Any ideas on how to resolve this would be appreciated.