I will be doing single coverage ER this summer out of residency. From advice of those around me, and my own thoughts, the situation you describe is incredibly rare, especially in a low volume center like where I will be. With 5-15 patients a day just based on probability you won't see as many emergent cases. Despite this, I made sure back-up was good as well and there will always be a physician back-up in the community who is more experienced with procedures if I find that I need extra help.
Then of course, knowing your principles, doing as much reading as you can, and having a good plan for these scenarios is optimal. Start with VL, know your airway algorithm, prepare for surgical airway, use techniques that maintain airway reflexes if you are particularly concerned. Simulation can't be understated for High Acuity Low Opportunity scenarios; take extra courses to fill in knowledge gaps.
And lastly, something that often goes unsaid is that, unfortunately there is an understanding that due to nature of the location that these patients live that health care outcomes may not be as good compared to living across the street from a Toronto hospital. You just simply can't get Icatibant and a specialist with an airway fellowship to your patient in five minutes. But you do the best that you can to bridge health care disparities.
The more you think about it, it's pretty backwards that the areas with the lowest amount of resources also have practitioners with the least formal training.