"I suggest a quick easy money maker is to MAC the existing British Peninsular set and provide extra sprues of alternate heads - 1812 and tapered light infantry shakos. The molds already exist..."

I think there maybe a fundamental misunderstanding of how plastic figure molds are made here. The mold that already exists will make the set that already exists you cannot use it to make different sets. You may be able to use the master figures to make a new mold if they survived the mold-making process but that is a pretty expensive process.