Existing SmartThings hub or buy Conbee?

Hi!

I’ve acquired some plugs, sensors, google home-stuff since I’ve moved to a house. I am going to need to get a lot of stuff talking with each other when I am setting up a new plant house that must be heated and plants watered automatically. The equipment I have is many Aqara temps, Mi Flora’s, Deltaco Plugs, some Philip Hue lamps, a M2 Hub, a Philips Hue Bridge, Google Home/Mesh network and a SmartThings hub.

Hence I am looking at buying a Raspberry Pi and setting up HomeAssistent on it.

I have a few questions, some that probably is obvious for someone using the gear but that I haven’t been able to find answers on:

  1. Should I buy a Conbee II or use my existing SmartThings hub to communicate with Zigbee gear?
  2. Can something be connected to like both my Aquara M2 Hub/Philips Bridge and to HomeAssistent?
  3. I have some Bluetooth gear that will be central in important configuration for my plant house, like Mi Floras (or is it Mi Plant?). Anyway — can the RasPi connect to Bluetooth gear, or do I need some other conbee similar stick that can connect to Bluetooth, or is it better to have one of those gadgets that connects BT to WiFi?
  4. I would like to have my RasPi also function as a NAS. Is it somewhat easy and reliable to install that equipment and have many functions? Like Decker instead of directly go for the Hass standard directly?

I am tremendously great full for any thoughts, advice, tips and tricks you might have! Thanks!

Please no double posting!