Sorry, but taking the grid reference order provided by the game as a base ( which was historically used) and then reversing the number order when the maps stops displaying it further than 4 levels is just plain silly. Common sense would be to continue the same order just to avoid confusion. Using the keypad ordering has little benefit over the existing order. I would say it is only because of muscle memory for those having a numerical key pad on their keyboards. That may be the majority of players but it is not a rule that everyone has one. Aside from that, those that are more used to telephone keypads follow the KM grid order anyway.
In discord a common counter argument is given that it doesn't matter, as long as it is agreed among players before the game starts. Well, that last part is true. Agreements made on deviations to conventions trumps always. (no politics in there
) But that only works if you know who enters the game session. If you leave the lobby open for players unknown to you and they enter a different boat then you cannot be sure of their level of understanding. Following conventional grid numbering (as was historical and exampled in the game) is then the most simple and right course of action.