Subject: Re: OT— USD diversification
I use moneycorp.com to exchange currencies. Its not brilliant but serves my purpose.
Fidelity lets you buy currencies in a brokerage.
I choose my currencies based on my needs as well as "hedging" a little. in Dollar, Pound sterning, and euros.
some discussion in last couple of days on this on NON US stocks page, refer you and your question there.
good luck.