Another vamp chord progression you can use is this:

I – IV7
Some of you might be thinking “but the IV chord isn’t usually a dominant-seventh chord… nor does it resolve to the I.”
Remember this from previous posts: in the twelve-bar blues progression the IV chord resolves more naturally to the I than the V does. Plus, the IV chord harmony appears more frequently than the V chord.
In addition, the IV7 chord provides the b3 scale degree. b3, which is in the blues scale.
Play around with it and see how it works!
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