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jono84
Something like https://www.amazon.co.uk/Garden-Security-Locking-various-sizes/dp/B08546T2ST/ref=sr_1_4?_encoding=UTF8&c=ts&dchild=1&keywords=Reinforced+Bar+Locks&qid=1603970039&sr=8-4&ts_id=1938446031 that can slide through multiple/changing numbers of frames?
If the chain/anchor rigamarole makes accessing bikes a chore/not fun - perhaps it's worth the trade off of sacrificing some security, if you are satisfied that bikes are a) in a (nominally) secure building, b) insured anyway. That said replacing mine would be a financial but not sentimental burden so YMMV.