Be careful how hard you push this, or someone will decide that you need to use _conductive_ polyethylene as your vapor barrier. Making a conductive vapor barrier is no big deal; you just add carbon to the film and $$$ to the price.
To the OP: Don't try to paint the lily; you recognize that with the electrically insulating vapor barrier you don't have a proper Ufer electrode. Don't try to make something new up to overcome this issue; instead just install one of the code accepted grounding electrodes, and move on. Two ground rods is a very common approach, but plates, ground rings, etc. are other options.
If the local AHJ continues to require connecting to rebar, just call it 'locally required bonding' and move on.
Ufer type ground electrodes are great, but unless you are handling explosives in the basement I'd put the money into better corrosion protection for the rebar, and just use the minimum required grounding electrodes.