I hit 640 miles on my 2014 Ninja 650, and I could not get an appointment sooner than a week out to have the 600 mile service performed (I would have most likely added an additional 100+ miles). I went ahead and changed the oil myself. I used a KN filter (KN 303) and Mobil 1 4T 10w 40 motorcycle oil (https://mobiloil.com/en/motor-oils/mobil-1/mobil-1-4t-motorcycle-oil
I was a Honda (auto) technician in my youth (2 year AS in auto tech, multiple ASE certs, Honda factory silver level training), so I know my way around a machine. My guess is my bike will be perfectly fine making the switch to synthetic oil right after the break in. BTW, the break in oil looked like it could go another 3000 miles or so XD. It was very clean, just a tiny bit cloudy. The 2014 oil change was very close to what was posted here, the only differences:
The oil drain plug is on the LEFT side of the bike (riding position), opposed to the right.
The entire fairing comes off as one piece (one, each side).
All of the other tips apply, such as reusing the drain plug washer (or replacing it), the oil filter having been tightened down by Thor at the factory, using a shield to prevent oil from dripping on the header pipes for the filter removal for easy clean up, etc.