OK So I ended up ordering a few Bordo Lites - the combination model over the key model. Wanted something that would be most likely to get used so weight and convenience were the deciding factors.
The Bordo Lites can be permanently installed using the silicone holder and the bottle cage mounting holes and a combination lock means no key to carry. The Lite version is almost half the weight of the others. The frame sizes are 'S' so no other lock would be as unobtrusive when riding. Cable and U-locks are far more common here, sooooooo ......... they're on order.