I know this is very late in the day, and some of you will have set off for your trains in the morning before seeing this, but having said that 15 was too many and Dave having ignored me and gone for 17, I've now got another wild card. From my copy of Camra's Real Heritage Pubs of the Midlands:
Rose Villa Tavern. It's a similar distance from the Jewellery Quarter station & tram stop as the Jewellers Arms, so if there happen to still be 20-odd of us getting off the tram at the same time, a split might be advantageous when it comes to getting served promptly. Not to mention, it seems to be a lovely pub.