Hi, thank you for this hack, it works and I used the same resistance values as you 300ohm and 470ohm.
Even if there is a delay of 6 seconds when closing before the “closed” command is sent it is not a big deal because the “open” command is instantaneous.
Note that the closed command won’t be sent if you open it again within that 6 seconds delay and you will basically receive 2 open commands in a row.
Now i can actually use this sensor for something not very critical (because it doesn’t report low battery level if i am not mistaken) instead of sitting in a drawer.