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total unknowns i'd start by trying to exploit the population tendencies
If you have unknowns in 500$ HT 6 max SNG then probably using Nash equilibrium ranges makes sense.
For more usual scenarios like lower stakes SNGs taking into account population tendencies on current stakes is much more important and efficient then Nash equilbrium.
Also note that assuming that your opponents are shoving according to Nash equilibrium is very often a big mistake, so call ranges will be far off in most cases.