It's time to count all pins to select MCU.
For every SFP DDM needed 3 pins, summary it's 9 pins.
InGaAs photodiode needs 2 pins, summary 4 pins.
Laser diode driver needs 1 pin.
Two Opto-Mechanical switch needs 8 pins each.
Control buttons - 4 pins.
Display spi - 5 pins.
So summary I need from MCU minimum 40 pins.
For making economy on MCU pinnouts, I think to use multiplexors for SFP and for switches.
Working now on mux selection...