You can do that with teslas. Buy two keys (they at those credit cards sized keys) and you pair them on your own. Two for $40. Do it right at home. You can pair multiple cars to a single key. Or make guest keys
This works for most modern Toyotas - there's a sequence of door openings which put the car in pairing mode and will link a new key.
This works for most modern Toyotas - there's a sequence of door openings which put the car in pairing mode and will link a new key.