Animal fat does not cause heart disease. The research in the 1940s that implicated saturated fats, was done on artificially hydrogenated vegetable oils, which researchers mistakenly believed were equivalent to animal fats. Now we know better.
When this nation ate mostly butter and lard for its fat sources, heart disease, cancer, and infertility were very rare. Replace those with vegetable oils -- hydrogenated or not -- and look what has happened to us. Worst of all, this result was PREDICTED back in the 1920s or 1930s when the changeover was just getting under way. Nobody listened.
I just would not do it for my children. I don't think heavy meat on a regular basis is good for kids anyway, young kids. You are right about the hydrogenated oils. Look at the number they did on coconut oil.