Are you saying you want to correct offsets which have a
source external to the comparator?
Correcting a continuous-time comparator might need you to
ping-pong a pair of autozero comparators, use one while
zeroing the other. But autozero tends to have a lower frequency
bound, set by bleed-out of the "trim memory" capacitor(s)
against leakage terms, so then you can't just ping-pong by
clocking on output transitions or like that, if input signal of
interest is quasi-DC and sparsely triggering if at all.