Easiest to do this with a standalone.
Create a qube and set netvm to a vpn or Tor qube, sys-vpn or sys-whonix.
Attach the wireless adapter to the new qube.
Configure the new qube as a router - many guides are available online -
search for “wireless access point Debian”
Start the qube, connect to the new access point from other wireless
devices.
If you need help, set out what you have done, with what success/failure, and
we’ll try to help.
I’ve not had success with tethering, and there’s an open issue asking
for support for it.