@GLSILVAUK , Welcome to the community!
On router level (Conenct Box/Giga Connect Box) this is not possible.
But you could do the following:
- your modem must be switched to IPv4
- you set your modem to bridge mode and then switch on your own router
- on your own router you activate the VPN service
or
You install a VPN server on your computer and use it.
For the switch to IPv4, please contact your provider in Slovakia.
Greetings
Daniele