Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

You should have known most machine shops won't bore/hone just one cyl. They are in the business to make/ take your money. They want to door the whole block over again. All 8
Everybody who's in business, is in business to make money, the setup time to do just one don't pay very well in contrast. But every good shop would do one, they might charge a bit more per, like anything else.....if You would've needed a cylinder sleeved, would they sleeve all of them?? If so look for another shop, if "most", in Your area won't do it.