Don't think they would look at you any differently than if they saw you walking down the street. Though maybe if you're 7 foot tall and weigh 120kg you might get a few more strange looks
But seriously, I'd recommend a hotel WG for your first time, especially if you're only in HK for a short amount of time. With Siu Qiu gone, I really can't think of any walk up worth recommending. Try ringing up some hotel WG's agents in TST and if you're unfortunate not to be able to get a booking, then walk ups are a good backup plan since you'll be in the area anyways. I hear most of the hotel WG's customers are none-local anyways because the locals look for something more value for money so they go to china and macau for something much better (so I'm told, but will need other bro's to confirm this).