I am going to make a prototype so that I can use some sensors(3ea, 2 I2C, 1 UART)and read the measured values to the mono LCD(3~4line), In addition, Bluetooth can be used.
What do you mean by 3ea? do you mind to give some link to introduce this interface?
I guess the mono LCD would use SPI interface.
You could have a look on below link to see if EFR32BG could meet your requirement.
You could also try our parametric search tool to see which part could meet your requirment here: