Hi,
For combination circuit like this, We need one more module, which is Microcontroller. I think STM32F407 is best for this combination module. because it has SD interface for SD card,6 UART (usually for GPRS and Bluetooth), camera interface, and lot of I/O. For Charger module, we can use Texas Instruments charger module. But if budget / dimensions are limited, we can use ESP32 as Bluetooth and main microcontroller.
I have use STM32 since 2012 and has done lot of project on it. I have became pcb designer since 2012 and has done lot of project from Hobbyst, Robotic, Industrial, IoT, and Military application.
I have experience designing similar project like this one several times. And I know it's popular issue, including power issue, antenna issue, grounding, etc.
I will use Eagle, and 2 layer is enough for this project.
let's discuss the detail over messenger.
let me help you realize this project.
Best Regards,
Rijal