An arrangement like that which you describe could work, but it really depends on the parties involved. Some partners may agree to your terms, putting your desires before theirs (if, in fact, they want to have sex outside the relationship). Others may even be into the idea, and be turned on by you exploring.
It's good that you're thinking strategically, but keep in mind that your husband could theoretically get jealous of any of your partners, regardless of their gender. He could also get jealous of you, getting to have all that extracurricular fun, while he's barred from having any. You may have to go through some trial and error with this arrangement as well—together.
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