The LM4562 and LME49720 are the same part and both have slightly better specs on paper
I made a similar suggestion over on DIYA to someone who is op amp rolling for fun. But it is unlikely to improve anything since the output stage numbers would predominate, as the designer mentioned somewhere along the way. Also - this is just for the gain stage op-amp (the NJM2068). I'm not aware of anything that would effectively replace the output stage NJM4556 op amp in DIP8 format. That one is kind of a unique beast given the current capability.
FWIW the LME49860 is also the same part as the 4652/49720 but with slightly higher +/-22V max rails.
Thanks for the response. I also ordered up some SOIC-8 to DIP-8 adapters so if there is something better that is not DIP-8, I'll try it. I'll try anything, I'll even do what NwAvGuy says NOT to do, (largely because he said not to) cuz I'm craaaaaazy.
DIY, learning lifes lessons the hard way, one exploded op amp at a time!