The automation I’m using for E1743 can be found here. Note that this remote only sends initial_press events, which means only tap events are supported by my automation.
As far as the E1812 button goes, I don’t have one to test with, but I do have an automation here that you can use to help identify which button events the E1812 sends out and supports. That would allow me to put something together for the E1812, or determine if it will just work with an existing blueprint.