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By default wiced generates a .bin file after the .elf is created which you can easily find in the build directory. I am not sure which platform you are using. But generally you can go to 43xxx_Wi-Fi/tools/makefiles/wiced_toolchain_ARM_GNU.mk and mark
If you are on 4390x based devices, you need to change the tiny_bootloader binary type as well which can be done in 43xxx_Wi-Fi/WICED/platform/MCU/BCM4390x/BCM94390x_targets.mk
TINY_BOOTLOADER_BIN_FILE := $(BUILD_DIR)/$(TINY_BOOTLOADER_TARGET)/binary/$(TINY_BOOTLOADER_TARGET).hex
However, I have not flashed the hex file and done a foolproof testing regarding functionalities. But this should be able to help you in narrowing down the makefiles. If you perform the above mentioned changes, each time you perform the build you should be able to generate a hex file instead of the .bin file.