I have a feeling you’re on to something, but also feel this might be needed for a niche use case.

And like another comment pointed out, in-browser extensions obviously only impact the browser. But like you said you’ll be using it to prevent sites from knowing you’re using tor so that should be alright.

I like this idea for using “free” or suspicious VPNs. But all this routing would totally slow down the connection, especially on the already limited free vpn connections.