The kit contents depend on 3 factors:
1 the patients - age, type of pathology etc
2 the capability of the carer - doctor, paramedic, first aider
3 the capacity of the kit - size, weight etc
So I would carry a spray as a doctor running a rapid response unit attending medical emergencies and when I have an ECG for daignosis and a big car to carry it in
For aircrew after trauma I would use the space for other things - fluid resuscitation, airway management etc. I would not recommend first aiders give it to immersion victims.
You are welcome to PM me