Classic textbook example of what happens when theory meets absolute field reality. The funny thing is, even attempting this wouldn't bypass the locking mechanism it would just weld the frame to the contacts, blow the local thermal-magnetic breaker, and leave everyone in the dark

Exactly. Any professional working on real installations knows that cell locks run on dedicated, isolated low-voltage safety circuits with battery backups and fail-secure mechanisms. Trying to short a standard 230V or 120V convenience outlet with non-conductive material wouldn't do anything to the locks—it would just blow the upstream protective device or trigger the RCD/GFCI, creating an immediate electrical hazard without affecting facility security at all

Changing the transformer will not solve the problem and can actually be dangerous. These LED strings usually run on specific low-voltage series configurations, like 24V or 31V DC. Standard replacement bulbs bought online are typically rated for 12V or 230V, which is why they do not light up in a high-voltage series circuit. Trying to replace the transformer with a different output to match generic bulbs could overload the thin wiring of the festoon string, creating a serious fire hazard. Unless you can find replacement bulbs with the exact voltage and pin specs of the original setup, replacing the entire light string is the safest and most economical option.