To the OP, what is your goal for changing setup? I understand its all testing and trying to find what works for you. What is your current setup, what don't you like about it or what aspect do you want to improve? One of the rabbit hole that happens a lot is we (saddlehunters) like to go off the rail and start advocating our own personal preference instead of solving the original question! I'm very guilty of this! So trying to give you a few difference view points here.
If goal is reduce # of items in your pouch. The Safeguard is the jack of all trade and master of none (my view). It does not rappel or SRT or act main tether as well as other devices. BUT it can do all of that. If you are using your rappel rope as your tether, all you really need is rope, safeguard, carabiner and retrieval rope to hunt. Well also your preferred climbing up method.
If its cost, then the figure 8 is hard to beat and easy to learn. But I think a ATC is more simplistic and new user friendly. Same price but you also need an additional prussic rope.
If a sense of safety is what you're looking for. Having multiple redundancies is not bad or that inconvenient so you can get your preferred devices for that method. Personally, I like a traditional prussic for my main tether to one stick climb and sit. While I also have a dedicated rappelling setup with a GriGri. The Grigri is smoother than the safeguard, but it slide very easy with slack which make it horrible for actual hunting without a backup.
Bonus note: Once at hunting height. Also consider making a backup 'disaster' knot with your rope. I can't remember what it was call, but its basically using your main rope as a stopper with another carabiner to your bridge, if your main device failed or slide, it would stop you from completely falling.