What's keeping you from simply asking "Gee, wanna fuck?" Seriously, stop trying to drop hints and simply tell him you're interested in a full contact romance--and that it's OK with your husband.
Why are you making it more difficult than it needs to be?
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.