yep I was also thinking about planting a hazel as a shrub or a tree. the one you linked to is similar to the Sutton's one - 50% hawthorn then a mix of other things including hazel. looks like a nice site though, thanks.
You could intersperse with Mirabelle plum trees which a guy down the road has in his hedge. They take trimming and in the summer he gets loads of tasty little plums.
Hazel could be another option, or mix:
https://www.habitataid.co.uk/hedge-mix-conservation-hedge?gclid=Cj0KCQiAk-7jBRD9ARIsAEy8mh4BmlOPET67fwopBzSB3XknvSG2gE2mRtJjjFPqhGVoeV-mQBAaB2IaArDyEALw_wcB