IIRC those stone crushers are used to stabilise ground on construction sites, I've seen them a lot on road building projects on continental Europe. A mate of mine hired one on a sports pitch build he was doing, they are cripplingly expensive to run, you're looking at thousands/hectare and a very slow work rate.

A power harrow will break the clods up and the tines won't break (they'll break your foot if you ever drop on on it when you change them), we have a Massey 8737 on ours and in certain conditions it's all the tractor wants. The OP will just have wait until the conditions are right for what ever tool he decides to use to work.

This is the one we have https://www.maschio.co.uk/products/power-harrows/jumbo-rapido-plus-p...