However it still won't give you any HDMI or audio or Ethernet output. If you try to get one more adapter, say HDMI to connect a projector, you won't be able to plug it because there was only one thunderbolt port in the first place.
£75 pounds for basic connectivity https://www.apple.com/uk/shop/product/MUF82ZM/A/usb-c-digita...
£120 pounds for dual display with dual USB. https://www.apple.com/uk/shop/product/HMX02ZM/A/caldigit-thu...
£230 for a dock https://www.apple.com/uk/shop/product/HMX12Z/A/caldigit-ts3-...
That said, it sounds like you're really not interested in this market and I recommend you look elsewhere for a solution.
https://www.amazon.com/Anker-Upgraded-Delivery-Pixelbook-A83...
https://www.amazon.com/Anker-PowerExpand-Adapter-Delivery-Et...