Well, there are a lot more experienced hunters on here than I am, but if it were me, I'd convert it to NW legal and leave it that way. My thoughts are that when I grab my rifle, whether headed to the range or out hunting, I want it to be ready to fire and I know it's gonna fire. I've read to many 'I forgot my <insert anything imaginable > and had to go back and get it.'
Also, once it's firing good with musket caps or primers, why bother with 209? Just my thoughts. I'm not sure about the optics you posted, I couldn't open the link.