And if instead of reactivating or deleting this project, you create another one and so you’ll have another token that you can put in Gladys, would that work?
That doesn’t solve the rapid expiration problem but it prevents you from having to start from scratch each time.
Another piece of information I just found: there would be a trial version for Tuya and if it stops, it’s possible to extend it: Configuration de l'intégration Tuya - #7 par Francis66
It’s also stated in the docs of the Tuya integration.
Is that the one? Système d'alarme Vigilia – Daewoo Security
Because there is only Wi‑Fi or Wi‑Fi+4G, no mention of Zigbee 
Here it talks about Zigbee but only for the Touch (AM301 / AM302), not the Vigilia.
On the Daewoo Security site, the Elite has Zigbee built-in.
For Shelly, which communication protocol do you have: BT (Bluetooth), Zigbee, Matter, Wi‑Fi?
We can now manage Shelly devices thanks to the Matterbridge platform and the Shelly plugin which allows routing all your Shelly devices through Matter.
The LIDL box is normally Tuya so if the Tuya integration works on Gladys 
, you should be able to retrieve your already paired devices.
EDIT: maybe you can enable only the zigbee2mqqt integration in Gladys and integrate Tuya directly into zigbee2mqtt. It looks a bit tricky but if it works better, why not.