If you want Paul, you can't just give them Kyrie. 7 year age difference or not, Paul is significantly better than Kyrie by basically every logical and statistical measure, and 30 really isn't that old, especially considering Paul is still playing at a near-prime level with no signs of dropping off. It's not like he exactly relies on athleticism; that IQ will still be there when he's older. The Clippers may be looking to restart this summer, but they're still not going to move CP3 unless a good offer is made, and if all we're giving them is Kyrie, some other team will put together a better package than that.
A Paul-LeBron PnR would be basically unstoppable. With Kyrie-LeBron, while Kyrie is a great shooter (normally at least), he isn't a good enough passer/decision maker to fully take advantage of a rolling LeBron and shooters out on the wings if he decides to drive in and collapse the defense. With LeBron-Love, defenses just switch every time, and the mismatches it presents aren't as significant as many imagined. For one, Love has looked weak and unathletic, which makes it easier for smaller forwards to contain him. And a PF guarding LeBron isn't that much different than the SF that usually guards him especially with the way the league has drifted towards small ball. However, a Paul-LeBron PnR would be as deadly if not more so, IMO, than the Curry-Green PnR. Paul and LeBron are both absolutely elite passers who are fantastic in the PnR. Paul can shoot the lights out and LeBron is a freight train barreling down the lane. If LeBron could somewhat find his shot, the play would literally have no weaknesses.