I'd also strongly recommend using something like the Strain-Injury variant (you can google it, I quite like it actually) and that way people would actually need to use the heal skill. Yay!
Your biggest issue by far if people aren't aware of magic etc. is going to be removing the curses / diseases etc that are obviously going to exist in this campaign (the players guide isn't particularly subtle about this). The rest can probably be resolved with downtime.
Beyond that - I think your characters would be dumb not to wear ancient magical armor they find while they're out adventuring!
