Mathed out 43:7 pretty quickly.  But how to implement it?

The idea here is that you can make 6 normal outputs and 1 output where lead replaces the silver that has no triplex bonds, more or less cleanly from 42 inputs, reusing a lot of machinery.  Then adding a 2 cycle gap lets you upgrade that lead to silver in an odd one out pipeline while obeying the purifijection threshhold.  But the odd one out is a little more expensive than I would like, and the tri arms are probably downgradable if I stare at it longer.  I would like to hope I'm within 100g of the winner, at least.