As the shell inside free space is only 3,8 millimetres high, at least the "normal" Kensington lock cannot be inserted from the side and turned to lock it, as the space requirement is a circle with a radius of 3,5 millimetres -> a diameter of 7 millimetres (almost double more than available).
Also the locking head requires a clearance of a minimum of 7,15 millimetres inside the cavity, so there isn't space to insert the Kensington lock from the back either.
Link to the dimensions below:
There is a Kensington NanoSaver lock available, but I wasn't able to find its dimensions on the Kensington website:
The inside plastic bezel with magnets causes problems with any slot and also the fact, that the side edges of the shell are not square in relation to the back/front.
It seems to me, that for any Kensington lock to work properly, there needs to be significant changes to the shell. And the worst part is that a lot of the changes require additional material and in return this means a new shell design altogether.