One of
THESE may fit the bill of what you are looking for.
You could probably build the CP to overhang it a bit, and just bolt it straight through the existing top.
It says they are available at K-Mart and Lowe's.
That one adjusts from 24-28".
Their "project table" has an even wider adjustment range on the height (28-36"), but may be TOO high, once you get the CP bolted to it.