Well, that's how I want to change the wireguard client on my router without having to restart the router because when I press stop on wireguard it's as if it didn't stop at all.
- Did you try disable config, save then restart?
- There's no need to disable such a tunnel, just change any rules and routes sending traffic to it (i.e. the opposite of how you configured it)
Otherwise, you'll need to explain what you mean by "disable".
Maybe I messed it up a bit.
What I want is to switch between vpn wireguard without rebooting the router.
Do you have your wg-interfaces configured in /etc/config/network?
Then you could use:
ifdown <wg-interface-name>
ifup <the-other-wg-interface-name>
Another option is, if you have your wireguard interface configured in /etc/config/network, you can option disabled 1 an interface and option disable 0 the other interface, and do an incremental reload/restart of the network service with ubus call network reload, which does not do the whole /etc/init.d/network restart with bringing everything down, and reconfigures the firewall, but only brings down old interfaces and starting new, or appling changes to existing interfaces. But I don't know where ubus call network reload is documented, I have this for reasons in my personal notes 
without commands impossible right?
With those commands it works.
But it costs me almost the same to enter those commands as to restart....