In my understanding ECH/ESNI shouldn't be an issue in this setup as long as the browser issues a domain-specific CONNECT request (i.e. "CONNECT google.com" instead of "CONNECT 24.154.13.11"). I think even with ECH enabled you should be able to impersonate the web server if you have a valid root CA certificate in the browsers' trust store. Remember, you're not performing "hostile" MITM-ing, but explicitly configure a proxy and root certificate in your browser. DNS shouldn't be an issue either as the browser leaves domain resolution to the proxy.
This is, of course, assuming that you can trust the browser to obey its proxy settings. (And proxy setting do not apply at all to local “smart” devices.)
