The problem with improvised solutions here in the first world is the issue of liability. Anyone can sue anyone else for anything, and first responders get sued by the people they have assisted with frightening regularity. The criterion used is 'standard of practice', and the responders behavior is measured against that.
So, if you improvise, and the outcome is less than perfect, the improvisation will be viewed as not conforming to standard of practice, and liability may attach. This is why certifying agencies make lots of money providing endorsements for ATLS, ACLS, and tourniquets: it offers a level of protection to the responder and the employing agency.

I know: if it's stupid and it works, it's not stupid.

But...lawyers.