Heck cattle actually were quite popular in France before the "nazi cow" nonsense came up (more on that in a future post). France was the first country where a serious evaluation on phenotype on the local Heck cattle was done (by Claude Guintard), and you find them in a number of zoos, pastures but also grazing projects. Here you have some photos:
Have a look at this video which shows rather nice, swift and agile Hecks with a body as slender as in Maronesa and good colour (horns and probably size aren't good however):
This site has pretty good animals too (Wörth lineage influence? UPDATE: Now I'm pretty sure that the bull below is a bull from Wörth):
My congratulations to the breeder!
When visiting Wörth, Walter Frisch (breeder of the Wörth lineage which is notable for their large and aurochs-like horns) told me that they sold their exquisite bull Aretto to french breeders, but unfortunately it died soon after a de-narcotization - I hope it passed on some of his good genes to this herd before his death.