Group Switches controlling MQTT Tasmota RF Bridge commands

I have a number of electric blinds that I control using Home Assistant ->MQTT → Tasmota -(flashed SONOFF RF Bridge).

Each command (open or close) shows as a separate entity and my dashboard has buttons for each of those commands, e.g.
Open Blind 1 has button mdi:blinds.open
Close Blind 1 has button mdi: blinds

x multiple blinds

I’d like to do 2 things…

  1. if possible combine the 2 commands into a single button (maybe mdi would change to the opposite after it was pressed). There isn’t a status sensor unfortunately and so don’t know if this is possible.

  2. And this is the main reason for the post…
    I’ve grouped 4 switches to control the 4 blinds in a room with a single Open or Close button. Unfortunately is doesn’t work as it is sending the 4 commands to the RF bridge too quickly. Is there a way to put a delay in the Group command in YAML? Or maybe some other automation that triggers switch 1, delay 1s, switch 2, delay 1s etc.

I realise this may not be best as a YAML thing and the delay can somehow be coded through a command in MQTT or Tasmota - I’m a complete novice on both of those though (even moreso than Home Assistant!)

Any advice welcome. Thanks