I'm not quite sure what options you don't have at 30 degrees AOB with 10-15 knots above the stall. I would say that you have a margin to manouevre in such a situation, even in a not very chuckable aircraft type. I agree heartily, however, that having to avoid people on final or elsewhere in the circuit is indeed vexing, but, as you say, the go-around in such a situation should be straightforward enough.
Small aerobatic biplane: probably a Pitts. There's a red one at Duxford that gives lessons. If it was purple one, that would be Stiknruda, larging it somewhat, merry fellow that he is. If you see him again, ask the chaps in the tower to see if those old Bloodhound missiles in the corner are still working.