BC on the 140 ELD is .646, BC on the 143 ELDX is .625. BC on a 6.5 140 gr Nosler Partition is .49. You shouldn't be focusing so much on weight. If you want a bullet that will shoot similarly to the 140 ELD, look for one with a similar BC that you can shoot at similar velocities. The ELDX fits that bill. The difference in POI you see at long distance between the ELD and ELDX will be much less pronounced then the difference you might see with another 140 gr.
If you're adamant on moving to another 140, you could try a partition or accubond I suppose. You're going to have to work up a new load though.