Trail is more important than fork offset- fork offset is just a method to decrease the trail on a bike with shallower head-tube angle or larger wheels- trail is the quantity that determines the handling of the bike.

If you're planning on loading the front, then a lower trail is better, around 45 mm. No load on the front, a trail of about 55-60 mm is preferable to stabilize the ride. So a touring fork made for slack head-tube angles and front pannier loads may have an offset greater than 60 mm, as mentioned above.

But if you're making a fork to sell, 45 mm offset is what most people expect, so that's the value you should use.

But you won't sell one to me for my touring bike. Fortunately, the front-loaded touring market is pretty small compared to the CX market , so I would optimize the features for the CX market.