You can. Will need to share a few circuits and maybe some relays. I like the M.lock, little glass tube placed in my wallet means only I can drive my car. And it is a totally separate system.
If you use the M.basic or Blue, you will want to document the wiring very well.
I would add a few relays to run like the dash area, and other not critical things. Decided up, each person has their own idea of what is critical.
For me it would be fans and wipers. Gauges, I'll be fine, GPS app shows current speed. Headlight motors, GT kit. Stereo, I can live with out it, just a distraction anyway. and adds weight to the car, though I like my audio books for long trips.
And then the Switch reduces the power load on all the switches in the steering stock, brake light flashers programmable.
Then other details to go with the M app, tire pressure monitoring, the m.lock, other relays and modules.
I might need to order one for my EG build......
Only down side I see with it is everything is a 10 amp fuse for all outputs expect start and aux2.
Can always get around that with a relay or solenoid if needed.