Russ, you're on to something there with the Murphy's Oil Soap I believe.
In reality, I don't know if it's even possible to ever get a close count of all the different marketed and home-made patch lubes out there,,, it's such a broad area. I'm always rethinking my patch lubes and testing them, and in reality I pretty much get the same results with all of 'em.
The spit patch IMHO is the way to go for target shooting, however you do need a good patch lube for when you run out of spit on a hot day,,, as well as needing a patch lube for hunting as to not ever risk a rust ring where the patched ball may set in the bore of your rifle for a day(s), weeks, even months... Now this last part opens up another thought;
What did our ancestors use for a patch lube? I'm to the point where I'm beginning to think they used spit after their first shot, because I bet they walked or rode their horse to that local shoot after taking ol' Betsy down from above the fireplace mantle - and ol' Betsy was probably cleaned and reloaded before putting her back above the fire place mantle - and I bet she was'a loaded with a "grease patched ball" as not to risk the rust ring a spit patch can cause setting in a bore - over and over again. It wouldn't surprise me if all walks of lives back in the 1700 / 1800 / 1900 / and to this day - those who hunt seriously and know what they're doing with their smoke-pole,,, load with a lubed patch in that ol' meat get'er if'n it's gonna possibly set for any amount of time while loaded.
So, what does this have to do with today's patch lubes and potential patch lubes we may come up with???
Well, I'm thinking,,, are we looking in the right places for these patch lube idea's? What would our ancestors have had available to them without today's science of ingredients for potential patch lubes to use to make their lube? Who knows, some might of just used opossum fat and called it good, but they could only use what was available to them.
Now just speaking for myself, I've found spit to be really good for target shooting, and I've found spit on a lubed patch to be just as good and perhaps even a bit better.
IMHO, finding or making a homemade patch lubes is just an extension of our hobby/sport we enjoy so much.