No ISO option on this PCB? Is that right? Seems an oversight given so many boards offer this?
It's not an oversight, it's a design choice, to preserve the integrity of the plate, hence the very limited switch position options. Plates with ISO layout cutouts on top of ANSI layout cutouts are a mess around the ISO Enter. Since the plate in this case design is an integral and major design feature, we wanted to make it the best it could be, rather than compromise it for a small minority of potential users.
The Zeal65 PCB supports ISO Enter, so if there were enough people wanting a Zephyr with an ISO plate, then it's possible we could arrange that.