You won't lose your I140 once

it is approved. You still can file CP when working inside U.S. Before, when there was a long waiting for I485, a few of my friends filed CP instead of AOS, they traveled to Guangzhou when it was their turn and got an immigrant visa. And it took them less than a year to wait, a lot faster than I485.

But under current situation, I don't know if you can still file CP. Consult an attorney if you want.

Why do you want to abandon your already pending I485? You got the advantage of everything, EAD and AP. I suggest that you keep your I485 pending as before and wait patiently.