Pixl.js v2 requests?

Hi! Right now I'm running low on stock of Pixl.js, and rather than just making more of the same, I'm thinking now might be a good time to do a whole new design, maybe taking a few hints from Pixl.js Multicolour badge, which I've been using quite a lot myself recently.

So I'm thinking:

• Same low-power LCD
  
• RGB backlight
  
• Use an nRF52840 (256kB RAM, 1MB flash, USB, etc)
  
• Make board wider, and add front-facing buttons and Arduino ICSP/SPI connector
  
• Do not solder Arduino headers to keep it thinner, and just stagger them slightly so you can still push in an Arduino board if needed, or can solder headers yourself.
  
• Add a Raspberry Pi compatible header (maybe just the first few pins that everyone uses) to allow connection to a Raspberry Pi or the whole ecosystem of Pi add-ons out there
  
• Add a pinout for (or possibly pre-install) an ESP8266 for WiFi
  
• LiPo charger and power switchover circuitry (maybe on/off switch) - make it on a Jumper so you can still use Pixl.js off 12v if needed.
  
• Remove CR2032 battery connector
  
  

And possibly:

• Microphone (to allow Tensorflow voice recognition)
  
• Piezo speaker
  
• SPI Flash
  
• 4x H-bridge outputs
  
  

So the idea is to keep the super low power consumption of the original Pixl.js, but to put a bunch more features on it so it's far more usable as a standalone board.

Does anyone have any ideas for improvements, or likes/dislikes of the original Pixl.js that might be worth taking into account?

Thanks!