As Test says most 141 WGs will not be good as "Guides", but there are local girls on 141. However I would make sure the girl is the real deal (they will charge premium rates), and one test is they will likely speak Cantonese. They may have issue though with maintaining anonymity, but you are new BF right?
Don't pay all up front, pay instalments, and have "out" clause to take her back if it doesn't work, trial night/day even better.
I know people who have had a WG for a several days as "companion" (me included) and had a great time. Personally I wouldn't worry too much whether she was a local or not, but would want to be able to speak with her so at least a little of common language between you would be good. Bipola you are from Canada? Are you Chinese Canadian or just English speaker?
One bro had mainland girl so yeah sure she wasn't tour guide, but good companion/fuck buddy to share the experience, like a tourist couple. HK is not hard place to get around and have a good time coming in cold. She was absolutely wrapped, got out, restaurants, some gifts, only had to fuck the one guy, and was great GFE. She didn't want to go back agent.
Let us know how you go, looking forward to your report(s)?