I may not be understanding you correctly, but.... If you've got the tools to do your sprockets and lack only the tools to do your chain, buy a chain breaker (or even easier, have the place you purchase the chain cut it to length and use a universal link).
Personally, I don't travel without a chain breaker. However, I've never carried the large socket and handle required for my front sprocket. Even at home with all tools at hand, it sometimes takes an impact wrench anyway.
Regardless, it doesn't take a Honda dealer to change sprockets and chain--anyone can do it. Look for a small, local bike mechanic and let them know you're on the road and need some help. Assuming you've already got the parts, the job itself is not a big deal.
Don't know if that's helpful, but I hope so.
Mark
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