Here is a stone I would love to have for travel. Sized as the typical barber hone, I'd like to have the Naniwa 8K on one side and 12K on the other. Or maybe a 5K/10K.
Packaged as a stone that fit comfortably in the hand, that could be a killer travel and touch-up hone.
For those who don't want to do more than touch-ups, it could be the only hone they ever owned.