Here is a clearer picture of what I want to do:
-Live off of cash for five years
Ahhhh, cash! I get it now. Unfortunately, I don't think there's anything (pratical) that you can do to stop the dividend payments. I think the solution is just to convert less to the Roth by the dividend amount. If you (re-)invest those dividends, they'll still be there for you to use for living expenses in 5 years as if they were in your Roth all along.
So receive $2k worth of dividends, convert $30k to Roth, $32k invested until 2021, tax free access (if still in the 15% tax bracket), and $32k income for ACA reporting
or
receive $0 worth of dividends, convert $32k to Roth, $32k invested until 2021, tax free access, and $32k income for ACA reporting
There should be little practical difference between the 2 scenarios as long as you're still in the 15% tax bracket and no tax laws change in the next 5 years.