A 1.25" barrel which is the max diameter of a HV barrel is larger than the diameter of a CZ452 action, and likely unneeded for best accuracy in a rimfire anyway.
I agree, the heavy barrels are a thing of the past with rimfire. A med (.825-.875) reverse taper or straight with a tuner is the ticket.
Call Jerry at benchmark barrels or Shilen . Both are putting out a superior product.
Jeff