Ironically we may be in better shape now for a gold standard than in 1973 as our money supply has not, IIRC, increased as fast as the price of gold. Assuming, of course, that there’s any gold remaining.
As for FDR, not only did he lawlessly seize the gold he immediately turned around and devalued the paper money he made people take for it ... FDR was a total scumbag.
Aside: the Constitution specifies the States cannot pay except in gold or silver coin ... we should hold them to that.
Go ahead and tell them they must pay you in gold or silver and see what happens.