12v Kids Powerwheels Project Complex Electronics Setup

Hi all,

I'm working on a 'project' for my little boys powerwheels/ride-on. I've seen lots of people modding these things for speed/power but I'm going for advanced tech. Having trouble getting everything synced I suppose.

The basic setup:

• 2x 6v 7Ah batteries in serial
• controller/mainboard
  
• push button power switch
• throttle pedal/switch
• forward/reverse gear switch
  
• USB audio input
• 1x speaker
• LCD voltage display
• 2x 12v 550 motors
• 4x LED strips
• 2x LED 'headlights'

My extras:

• 2x 12v 1.2Ah batteries
• parking reverse sensors
• rocker switch (to isolate parking sensors)
  
• wireless alarm system
• 1x additional LED strip
• 2x speaker

My aim is to get all the 'accessories/lights/audio' onto the smaller 1.2Ah batteries wired in parallel and leave the 7Ah for powering the motors/wheels alone. I bought the wireless alarm system with the aim for it to be some sort of splitter for the 2 circuits or maybe a pre-circuit to the motors being turned on? Something like - keyfob 'opens' car and activates 1.2Ah accessories circuit then push button power switch turns on the 7Ah motor circuit with throttle pedal/switch to drive.

Can someone advise on if this is possible with the stuff I have and if not, what do I need? I've attached the alarm system schematics images with notes on what I know and don't know. My main confusion is how the alarm 'allows' or immobilises the ignition (of what would be real car - for me it's the push button switch). Any help would be great!!!