I'd keep it simple.
From the NEC into the city is like 20 or so mins after the rush hour. There are loads of quality girls around China town, off broad street and in the jewellery quarter. All can be walked in around 20mins.
So make an arrangement with a girl, factor in a plan b / c. Get the train from the NEC into town, walk to where you need to go 5 to 10 mins China town, 15 or so mind broad street, 20 mins jewellery quarter. Google map the area, so you know roughly where you're going.
Once done, Uber back to where you're stopping, if anyone questions, then you just met up with someone in town for a chat up.
The travel costs can be deducted from the Outcall vs Incall costs.
Finally, as others have said, make sure you read the small print re girls not seeing certain races, creeds, colours but don't be too up front either.
Enjoy, be safe and be respectful.