I definitely think improvements can be made to the current process. However:
Rotating Responsibility: Create a rotating schedule where certified members take turns being responsible for opening and closing the space. This way, the burden doesn’t fall solely on a few individuals, and the space can remain open during different time slots
I think this is fundamentally against the ethos of the space as it would require (if I’m interpreting what you’re saying correctly) certain members to show up on a schedule. As of today, the burden of keeping the space open does not fall only upon a few people, any of the dozens of members with shutter access are able to open the space. They should, if planning on coming to the space, create a booking on the calendar for the benefit of members with access, which I know many of us have been lax to do. Though it looks like there is a booking until 6.
Here is the current shutter policy:
https://discourse.southlondonmakerspace.org/t/how-to-access-the-space/52/36
I’ll also add, very occasionally, the red X/green tick can bug out, showing red when it should be green. - I’d trust the booking on the calendar over a red X