The answer for you depends which state you are in, Aus protoclos don't usually recommend usuing a fistula most services here frown on it, having been a phlebotmist it doesn't really matter. If you can't find a view look a bit harder there are plenty even if you have to use a 24g.
As far as the IO the protocols here only allow for Tib and Humerus so either/or, the coroner takes a dim view of sitting back and not acting when it is in the scope of your protocols.
Do you have other options? Tubed, nebs with assisted chest compression?
Anyways as others put itgo with what you have got, people die from not breathing infection is slow, and fistulae can be replaced.