[Elgin Clock]

I've worked a bunch of positions in volunteering official events & off-seasons, & I'll say that volunteering at a "lower" position helps just to get the logistics of volunteering down before moving on "up" to a Safety Advisor.
(I only put those terms in quotes because I think every job at a competition is equally as important & necessary to have a successful event)

You actually seem a lot more qualified than I was at the time I was asked to switch from another volunteer position to a Safety Advisor last year at a regional event with your medical training, but the facts are that while in the Safety Advisor position, you will not be acting as an EMT or anything like that - unless it's to assist the on-site EMT's if ever needed (But probably not - that's what they are there for).

The jobs of a Safety Advisor mainly include advising teams on good safety procedures, so as long as you have a good understanding of the Safety Manual, you'll be fine.

You're also a Safety Judge at the event as well, and will talk to every team about their safety practices, & honor a Safety Captain at your event each day & also pick the best team(s) who exhibited the best safety procedures during these interview & hand out some awards.

(This was the experience in my event anyways, & was similar from hearing the stories from a friend who was a Safety Advisor at a different even last year.)

Sign up, & when FIRST calls you for your interview, tell them your about EMT background, but it is just an added bonus of your skills for the position.
You should be good to go.

If you want, PM me as well, & I can forward to you some basic info I received while I was Safety Captain last year so you can get a head start.
(If I still have it.. I'll have to look into that.)