Honestly, that description of the Borg is even more horrific and terrifying than what they already do. As a horror fan, I applaud you.They could assimilate minds and discard bodies, placing the minds (the memories, not the actual brains) into bodies they felt were superior. Which would change as they found newer, better "models".
Similar to the Cybermen of DOCTOR WHO. (For my money, the scariest villains of that franchise because of what gets done to you.)