You will need sar.asl which you can get here: https://gist.github.com/NeKzor/6db7ca6a28ed55fbcce7d8af7edf0f18
Then in your livesplit layout add an auto scriptable timer, double click it and where it asks for a file select the asl file you downloaded. That should be it

would you mind sending a video as an example? Also if you have a big enough playspace you can abuse it by walking to the very end chamber door in chamber 5.

Can one of the mods add this to the resources? Thanks in advance

Check guides and go on the doc. One of the first links should be a tutorial

An alternative to walking IRL, you can put your hand through and teleport blindly. Even then, you won't be able to go into the funnel because the game will check if the door has been open at least once. Good to see this community is getting some more attention