Well... I think this works, but it is a bit dubious.
Start out with an extra action, Trading Post, Trader, Silver, Copper, Copper, Menagerie. You can play Trading Post to Trash the two Coppers, but you don't want to gain the Silver in hand so that your Menagerie will be activated. Revealing Trader disrupts the gain in hand ability of Trading Post.
I thought of TINAS's first answer too, but didn't feel like trying to answer the sub-question. Since you can always not spend you extra money, I am skeptical that there is actually a valid answer to that one.