Is this possible?

[compdoc]

> Overprovisioning is only important/useful in the absence of Trim.

That doesn't seem to be the case. Why else would the software from the
manufacture set a certain amount aside on systems that support trim?

>From Kingston:
"To avoid a scenario where the SSD is filled to full capacity with invalid
pages, over-provisioning is used by the FSP garbage collection function as a
temporary workspace to manage scheduled valid page merges and reclaim blocks
filled with invalid pages."

>From Crucial:
" Over-provisioning (OP) allocates a percentage of an SSD's free space to
improve performance and endurance. The OP space becomes available
exclusively to the SSD controller, enabling the controller to use the space
for various management functions."