As a precaution I would look @ a place around the 3K mile mark for new tires. Actually I would be sure to check the tires a lot: @ around 5K my rear is gone and the front is shaking hard. It was within 100 miles that I went from "OK" to "oh my". I at the time run your same combo.
Disclaimer: this is what many of the sport tour guys are getting around here on about any tire, so it must have to do with the road composition. Maybe where you are going is different. Check with the locals, I flipped about this but I started asking around and most were like "yep. Buy a few sets every year." As you can tell, these guys are serious.
Front wheel bearing change? Easy and safe insurance. Have them check the gear in the rear wheel when the tire is off. Brakes look good? Oh, and an extra J box would be in my bag. Or your current one w/ the relays replaced and crossed fingers: I would have the relays replaced in both!
That is a rough one when you hit the button and nothing and you are far from home. I would take off the cover and tap on it until I got home but not an exciting event.
A spare key, or 3. Keys fall in the worst places, and are so cheap to get spares! So do wallets, so keep one in your jacket or something. Hanging around your neck? If you loose your head, you don't need a key!