mtnjim Yes, you won’t have any problems stuffing them into fibrous casings and making a summer sausage, off the top of my head I can think of two Excalibur Seasonings that actually say Summer Sausage / Snack Stick in the name, so this isn’t something that would be uncommon! The process of Snack Sticks and Summer Sausages are very similar. Both are going to have the same fat content (ideally somewhere in the 70/30 range) both with be ground through a 3/8 and then a 1/8, you would mix both until they have protein extraction so the only real difference is the seasoning, the casing and the time it takes to smoke them!
Good luck, you should be fine and your mix sounds awesome, though I think I have already told you that!