675 New To Triumph, Question Before I Buy

Been shopping around for a Street Triple for a few months and I think I found one. Just have a couple of questions before I buy.

Its a 2009 Street Triple R with 23,000 miles on the clock. My biggest concern is the seller hasn't ever had the valves serviced and has no history from the previous owner on the service. If I buy I'd be buying on the assumption that the valve clearances have never been checked or adjusted. Would this be a deal breaker? Ther service manual I found online said they need to be checked every 12,000 miles so it basically missed the first check and coming up on the second one.

I ride a 2009 Versys 650 now and have done two valve adjustments myself on it. Are the valves much harder to service on a Street Triple other than having a third cylinder? From the schematics I've seen, the engines look similar enough at least on the top end.

Are parts hard to source for the 2009 Street Triple?

Any other issues I should check for?

Thanks! -DK