You can't make the seatpost bigger than the hole givin sorry. Most konas do have a 30mm spacing. So you best bet would be to buy a smaller size and use a shim to make it fit. I don't have an adjustable seatpost but I would check out the mtbr reviews to get an idea of what is good.
I used a Gravity Dropper Turbo on my 07 Coiler, it was awesome I highly recommend one. You can get a shim to size up the 27.2 Gravity dropper to fit the 30.0 seat tube.
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