That does not really get covered by either thread as the weight you are looking for means major compromises on security.
I know the sort of thing you are doing as often I am in a beer garden in a quiet pub in the peak district with the bike round the corner/out of sight etc...
Although heavier than your pound shop special, try looking at the small alarmed padlock options. Fitted to your chainrings can render your bike unrideable but a scrote could still run off down the street pushing it. Not great so anything remotely risky (eg small town) and I stick a mini evo in the rear jersey pocket.
That does not really get covered by either thread as the weight you are looking for means major compromises on security.
I know the sort of thing you are doing as often I am in a beer garden in a quiet pub in the peak district with the bike round the corner/out of sight etc...
Although heavier than your pound shop special, try looking at the small alarmed padlock options. Fitted to your chainrings can render your bike unrideable but a scrote could still run off down the street pushing it. Not great so anything remotely risky (eg small town) and I stick a mini evo in the rear jersey pocket.