If you are planning on putting the subpanel in your workshop (rather than
near the main panel) that would work fine. Other wise you could save $10 by
moving the dryer to the subpanel.

I actually had the BQC220230 in mind. That would give you one new 20a 240v
circuit without requiring a subpanel. (if I am reading the description
right anyhow.) Assuming you will never want more than a couple new
circuits, that is cheaper than a subpanel.