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use either concrete or plastic decking feet.
I'd do exactly this.
Something like these https://www.wickes.co.uk/Jouplast-Plastic-Adjustable-Decking-Risers---50-to-80mm---Pack-of-10/p/149406 will be much less of a pain to move/relocate should you wish too as well.
kkg337
I would have thought at the extreme you could use something like helical piles and drive them 3 ft into the ground… at the easier end, like you level the ground, compact it as much as possible then use either concrete or plastic decking feet.