I've split your post into your own thread. In the future please create your own thread.
To answer your question, no there is no option to upgrade the 2018 head unit to have Android Auto or Car Play. In my opinion, you're better off with the 2018 head unit as you have a ton of aftermarket options which are infinitely better than what Toyota has to offer even when compared to the latest Infotainment units.
It's up to you if you really want to retain the factory head unit. For the amount they're charging and the fact you can easily drop in an aftermarket head unit which would be by far better than the this retrofit plus stock head unit, I would opt for the aftermarket head unit.
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