Ultralight, being what it is, I'm of the opinion that a personal kit should focus more on an individuals own susceptibilities. Allergies, reactions, wound infection, brittle bones, etc.
Of course for a trained responder, a more rounded kit would be necessary for treating other peoples problems, but I think it's overkill to try and pack for every scenario just for yourself.
Multi-use seems a main mantra for first aid as well, splints, slings, wipes, even the Sawyer syringe for irrigation. Thinking about it, a specially devised bottle cap would probably work quite well.