Hello,
Do you know DD-WRT has default setup, or easy setup for this:
for custom scripts to manage
Fail-over to next server from a list, same VPN provider.
Move to next server if internet connection speed is to slow.
Killswitch - if VPN server is down, turn off internet connection.
Faileover VPN Scheduled Reuse
it is Possible using custom script you may contact for more details
i can provide Commands or do remotely and fix as needed, my script will run in background
and fix vpn if found dead service will restart using push Technic
Regards
Qamar