You don't even have to use preground meat, and really, I agree with those that do not recommend it because of the bacteria content. I only grind the bones in my food, and I chunk the rest of the meat into fairly bite sized portions (or larger, depending on how lazy I am feeling). Larger pieces are actually better for dental health, though they can make more of a mess if you cat likes to remove them from the bowl. Chunking the meat is also better because it will not deplete the taurine levels as much. I still strongly recommend adding more taurine as it is so essential to a cat's well being and you are never at risk of overdosing it. It is also very cheap. I got a one year supply for one cat for less than $10.
Of course with chunking the meat, a cat might be less likely to take to it right away. It really depends on your cats. Since you won't have a grinder, you won't be investing too much if they just don't like it though. You can try feeding them chunks of chicken to see how they like it before you even buy the bone meal if you are worried.
Catinfo.org does have a guide on adding bone meal for those that cannot or will not grind the bones for the diet. I would suggest starting with her recipe and making modifications from there. She uses a specific brand that she has calculated the bone amount for. As time goes on, you will find what works well for you and your cats and make modifications accordingly. I personally feed more red meat in my diet, as it contains certain nutrients and leaves a better coat on my cat than an all chicken diet.
Lastly, another option you might consider would be finding a local butcher shop. They might be willing to grind the bones for you, or even grind a whole mix for you, where you would only need to add the recommended supplements. This would be slightly different than the preground supermarket meat and more like you doing it yourself. Hopefully resulting in a lower bacteria load.