Laura 'Date' Attenberger I would recommend you dont do the powder, but instead roast garlic cloves and then grind those with the meat. This is what we did with some snack sticks and it was very good. I would recommend 2 medium-sized cloves (not the entire thing which is called a bulb) per 10 lb of meat.
If you need to use powdered garlic I would suggest making small batches with different amounts and just frying that in a pan to see what strength. It wouldn’t be exact as smoking and pan frying are going to produce different products but it will at least be in the range.