Appropriate tires are available in all adult sizes, don't think that 584mm is the only size that'll work well for gravel/dirt!
Yeah but with 700C wheels it can't take tyres wider than 40C... With 27.5 it should be possible to fit wider ones.
Don't do it. Buy one of those adventure bike things. Surly or whatever. It will be nicer, better and more useful for several kinds of riding. And more fun too!
@kjlem started
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Appropriate tires are available in all adult sizes, don't think that 584mm is the only size that'll work well for gravel/dirt!