I found this example of... something! - in the LTC2057 data sheet. Is that the kind of technique you are referring to?
Yes, that is the idea. The integration constant controls the breakpoint frequency between the two amplifiers. If you know the sensitivity of the offset null terminal, then you can calculate the optimum breakpoint frequency.
Many years ago I extended it to differential operation using a pair of LT1028s and an LTC1151 dual. (1) First I measured the sensitivity of the LT1028's offset null and then calculated the optimum frequency breakpoint, which ended up being right on. Noise performance was somewhere between incredibly good and impossibly good.
Linear Technology also published several examples of this with low noise JFET differential pairs which would be suitable if you also want low input bias current for higher source impedance.
(1) I used the dual LTC1151 because separate chopper stabilized amplifiers might have resulted in intermodulation between the clocks. Modern automatic zero and chopper stabilized operational amplifiers lack any ability to control or synchronize their clock which suggests that this problem has been solved.