Hello. Unfortunately, I don't have the m2010 itself, but I do have its younger brothers, the m170 and m1710. Perhaps it would be easier to use not video cards from newer Dell models with their proprietary connectors, but to take the conditional mxm3 standard and build on that? Then the adapter board would only need to have a connector for connecting the matrix and for installation in the motherboard (and the mxm connector, of course).
I would also like to note that in the T7600 era system BIOS, there were problems with using Nvidia cards newer than the 7*** series. A specific example is the Alienware m5500i-r3 (also known as FUJISTU AMILO) — with the older BIOS version, the new Nvidia cards did not work, but 3.5 gigabytes of RAM were visible and Radeon cards worked. With the later version, the new Nvidia cards worked, but there was a limitation on the amount of RAM to 2 gigabytes.