I'd ask, but wouldn't expect to get it.

It will be a computer says no situation, but the lounge angel may help out.

You'd basically have to show that you're silver with >=1,360 TPs and keep your inbound boarding pass showing that you'll have just earned 140 TP that haven't posted yet. Otherwise you'll be on 1,500 TP a day or two later, and gold probably the day after that.

As long as you don't draw attention to yourself, no one is likely to notice your "walk of shame." DYKWIA behaviour is a different story, but it's quite common for the Flounge entrance area to be pretty quiet.