Are there sny over the counter potassium-channel blockers?

No

Potassium
Because this would be extremely dangerous, as there potassium channels are quite ubiquitous (meaning in almost all cells). And the common potassium channel blocker are Class III anti-arrthymics (amiodarone, dronedarone, ibutilide, dofetilide, sotalol, vernakalant, and azimilide) and they can cause QT prolongation which can lead to fatal ventricular arrthymias. So it wouldn't be wish to have OTC.
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Amiodarone Dofetilide Kaochlor Kaon Kato Kay ciel Klor-con Klorvess Klotrix Potassium