I see there are some options out there for adaptor cords, and I'm wondering whether they'll work with the GFCI.
I’d advise you to consult a qualified electrician and the manual for your specific breaker for a definitive answer, but generally two-pole GFCI breakers require a line side neutral (this is inside the panel and is needed for the breaker electronics to work). However, on the load side you can connect loads with, or without, neutrals to the GFCI breaker.
Converting from L14-30 to L6-30 before the brew commander drops the neutral on the load side, so it should be fine. The GFCI will be looking for a current imbalance between the two hot wires and L6-30 carries a ground, so your equipment will be grounded.
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