Successful flash with latest Tuya-convert. Easy access labled pin holes for serial flash also.
GPIO16 > diffuser
GPIO14 > fan
PWM1, 2 and 3 on GPIO4, 5 and 15.
GPIO13 > buzzer
Power and set diffusion time LEDs left unassigned as well as physical buttons. They are located on a daughter board and it seemed to create issues causing me to have to reflash via serial after becoming inaccessible.