I'm no expert, but since you ask:
1. I'd go ahead & run the current oil for the 500 miles, then probably run some Havoline SM dino 5/10w30 for the next 1000 to 1500 miles. Then I'd run another dino OCI of 3000 miles or so. I chose Havoline because it's easily available here & has a healthy dose of soluble Moly, which can only help during breakin. Any good dino 5/10w30 should be fine though. For that matter, it's probably OK stick with the Syntec if you like. I'm just "old school" when it comes to engine breakin & synthetic oil.(probably a useless caution on my part
2. I'm not familiar with the LE Monalec, but I gave up searching for "magic" oils quite some time ago. You could probably run any good SM dino for a 5000 mile minimum after breakin. If you want to run OCI's of 15,000 miles, maybe try Mobil 1 EP?
All the above is JMO. Good luck with your Camry on whatever you choose!