I'd use "kill switch" software on your PC instead, which kills your access to the Internet if the VPN goes down. This way, if you accidentally disconnect from the VPN, your Internet also dies, and it's limited to your computer alone.

This is what I do - I can't use router-based VPN or piHole type stuff because people on my network work on ad-related products or use sites that don't play well with VPNs or DNS-block lists of advertisers, for example.

Of course, you can terminate the VPN software manually and the kill switch and access sites using no VPN if you want, which allows for mistakes, but pretty rare in my experience. Best is to simply have another machine that doesn't have VPN software on it and you use over the naked Internet.