A brief post to confirm that Talisman V2 will no longer require a seperate CPU, but will use the CPU that comes on the needed (WiFi and Bluetooth) radio module.
Earlier consideration had been given to the single core ESP-07, but this was upgraded to the more powerful dual core ESP-WROOM-32.
The above image shows the WiFi radio module – left hand is the top side view, right side is the rear view. It is 1 inch in height and thin.
This CPU also has more pins which makes it easier to wire connections to all the other components.