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@Bad_Rabbit
Personally, if I am locking up in a high risk environment I use my Abus Granit X54 as the secondary to my mighty Fahg. It is only half a kilo more than most of the weaker smaller locks.
The Krabus alarm U-lock I also occasionally use and I think works well as a secondary (just not as a primary), given it also has the alarm and weighs less than a 1kg.
One of the aspects people need to consider is if they are using the secondary lock on the front wheel, frame and post (unlike around the seat post, wheel, pedals etc.) is that it is not so easy to pack it out. Hence, I think secondary locks with big space shackles can be vulnerable. IMO I would look to use smaller space locks like the Evo and Kabrus as secondaries, over bigger ones.