Hiya Craig
Out here on your own with over 40 views and no replies?
I'll answer your question mate - I have the Abus disc lock but I must admit to never using it!
I must attach it to the bike and then I'll use it more!
It's too heavy to put in your pocket and I don't always have the panniers on.
Seems a good tough lock so I'll take your lead and fix it to the bike .. er .. somwhere!

Slight pause while I go and look at the bike.
I figure with a little careful use of a knife, the carry case it comes in could be cut and an 'aftermarket' buckle strap could fix it to the rear chrome rack I have fitted instead of the pillion seat.
Use the lock and at least the carry case will stuff into a pocket.
Thanks for the post and reminding me I have the lock and that I should use it ....