NordVPN switch between servers in different countries

Running OpenWRT 21.02.2 on my router.
Configured OpenVPN, to connect to a NordVPN server of my choice at configuration time.
But after some time, is the chosen VPN server is not the fastest.

So I want to be able to easily switch between servers in different countries.
At each connection, shuld the VPN router, connect to the currently fastest VPN server in the selected country.

How do I do that?

Want the "server change country function" to be done
through an interface in my phone.
Alternatively if this becomes too complicated
Log in to the router with a terminal and easily select the VPN country.

Use this script OpenVPN profile switcher for NordVPN
It works really good

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