Hello,
practically the only option is to use uci command and crontab. Using uci commands you can disable and enable vlan. More information about uci commands:
https://wiki.teltonika.lt/view/UCI_command_usage
With Crontab you can set up certain features to turn on and off periodically at certain times, in this case VLANs. I suggest you use a handy crontab generator:
https://crontab-generator.org/
