Limiting number of races for which sailors are awarded average points

In our sailing instructions anyone on duty (RO, safety crew etc.) is awarded average points (in our case, average of non-DNC races), but only for a maximum of 1/3 of the races sailed.

I can’t see that it’s possible to implement the 1/3 limit automatically in Sailwave. Of course I can change an OOD code to DNC manually, but there is a risk I forget this later if it should be changed back to OOD when more races have been sailed.

I saw an old post in the forum on this topic, but there didn’t seem to be a good solution.

Does anyone have any good ideas?