I don't think you will find that safety is treated as a matter of affordability in aviation. But I agree it needs to be as inexpensive as possible.
Let's see about some options;
- place the cord in some form of pocket where it cant be grabbed by someone else climbing all over you but is easy to get at
- Velcro the toggle onto the inside of the vest rather than letting it dangle
- make it a 2 action system to inflate the vest
- make it only inflate when in the water
- some other great idea from someone out there. Maybe an idea that costs very little but saves you
Hope you and yours never need it Bud.