If you want to keep the car long term, I'd shorten the OCI to 5000km 3 times and then end up with a steady 7500km OCI.
Oil is cheap. Engines are expensive.
As an aside, there are a few YouTubes that address Toyota engine wear issues that are attributable to following the extended
OCI's recommended by Toyota/Lexus. You may want to check them out. On most of my cars, I do 5000km (3000 mile) OCI's.
On the 2 that drive 30 minute one way drives to work, I stretch out my OCI to 8000km (5000 mile) intervals. How you drive your
car makes a big difference in your OCI.