Further update - Retronics just got back to me and tell me that they have had an issue with recent PCBs which have now been sorted. They have also offered a full refund.
A bit of bench testing suggests that the Classic Car LEDs 12VFL module is cleverer than I thought and is current sensing. This means that my re-wiring may well have been unnecessary. It looks as though I could simply have swapped out the flasher unit and grounded the flying earth lead on the replacement. Live and learn...
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