I was considering an LPCAMM2-fitted Thinkpad. I was eyeing to buy one with less memory and then buy a 96GB module to upgrade it. However, the module was nowhere to be found in stock, and where it was found, it was priced almost like the whole laptop.

CAMM is still less effective than in-package RAM bundled with your CPU. The Framework folks looked into using CAMM for their recent AMD APU-based desktop and it was a no go.