Thanks, Kleinstein.
If there is an offset voltage at the input sides of the OP, they will show up at the output even if the gain is small, I think. The OP at the 10 V boosting stage is the one that will affect the output more strongly. In particular, its tempco (plus the tempco of the resistor divider) will directly determine the tempco of the 10V voltage reference. After all, the resistor trimming tricks for zero tempco discussed so far is done prior to the boosting stage.
It could be true that the requirements (noise, tempco, aging, offset...) for the OP on the zener side is not so critical. However, the same conclusion may not be true for the boosting OP, right?
ADA4530-1 appears very interesting since it outperforms LT1013/LT1006 in the tempco by ~3 times.....