why can't you convert a fly reel to centerpin?

Centerpin drifting is an absolute blast. Could you use a spinner

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The Baitcasting Float Rod by Darryl Choronzey – Great Lakes Angler

4 3/4 inch Centerpin Reel Made of CNC Machined Aluminum. Reel Diameter: 120mm. Steelhead Coarse Trotting Barbel Float Fishing. Durable Quality, Zero

Float Reel Centre PIN Reel Steelhead Fishing COARSE Trotting CENTERPIN 4 3/4 120mm.

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