I’ve taken apart a number of these Micro SD card slots and desoldered them from their respective boards. I’ve never come across anything other than a latching spring mechanism. What’s more, it wouldn’t make sense to add a switch, it is completely unnecessary and would add unnecessary cost.
What also doesn’t make sense is why would such a cable exist in the first place if it could not fit into such an apparatus?
Have you even attempted this? I have an extender for my Raspberry PI that I use for ease of access during development and just tested it in the P1. It worked fine. I will say this though, there are devices out there that do not work because they are too long so that’s why I buy from Amazon, if it doesn’t work, back in the box it goes at their expense.