Have you spoken with or written to Honda directly?
Perhaps said dealer can’t be bothered with taking the bike apart, as it’ll fill his workshop with loose parts and god knows when he’ll be able to reassemble it all.
Worth having ago with another Honda dealer in my opinion.
You do not have to go for warranty work to a supplying dealer.
As a matter of fact vehicle warranty is valid worldwide. At least that’s what I believe to be the case.