I run a 30,5" 3-blade Varioprop on my K-100TP. Set at 19" pitch it does about 4.500 rpm on the ground.
In theory a 5-blade 26,8" prop should put about the same load on the engine as a 30,5" 3-blade, so I would recommend taking a look at the Varioprop offerings.
A 5-blade hub with 25,8" blades should put you back about 186,50€ (214,-$) plus shipping/taxes and such, and the adjustable pitch allows you to fine tune the setup.
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