Put me in with the guys that figure size helps in hand-to-hand but training and the match-up in different fighting styles matters more. An ex-GF of mine trains LEO's and special forces in bare hand and knife techniques. She happens to have above average female upper body strength but still significantly less than mine. In a serious fight she'd beat me senseless or dead every time (and twice on Sunday).
In terms of equalizers there are a couple more possibilities but, for example, pepper spray in a toilet booth is probably almost as effective on the user as the target. A flash-bang device would probably be heard outside the bathroom. Flash-only is a possibility. Ever looked into a decent camera strobe when it popped? I like the electric stun gun idea as well (Taser is a brand name and normally refers to the projectiles-with-wires type). If the bathroom includes any steaming-hot water dispensers (or perhaps coffee just outside) there is always the cliché hot fluid to the face.
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