The K-14 formula is no secret, it's all in US Patent 3,657,525. Due to the 1955 consent decree (antitrust), it's an open published process.
But the only source for some of the ingredients is probably Kodak (or maybe they subcontract to Eastman Organic Chemicals). But they may not want to sell them. You may need an organic chemist to make some of them.
Best use for 120 Kodachrome 64 is to slit it to 35mm wide for 828 cameras.