If I recall correctly most stuff with latitude on (laptops like E4300, E4310 and few others) had 2 pcie ports, one being used by Wifi, and another that was there for some feature that virtually nobody ordered.
I'm wondering if it maybe a simpler challenge to see if the 2nd mini pcie is fully featured and whether there is any BIOS blacklist on any other similar restrictions to prevent you from installing a pcie ssd.
Other obvious option is to ditch the DVD drive and install a tray for a 2nd HDD (done this many times myself), but this has the obvious drawback that you no longer have a DVD drive.
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