I've used a combination of conditioners on the same bag without problems. I guess you could have problems if you had too much of a build-up of conditioners. Sometimes you try different things just to see which one works the best. It helps to use thin layers and make sure they have really soaked in, and buffing, before applying more. Someone here also polishes the leather lightly with very fine steel wool between layers to help the leather soak up the conditioner better.
For mink oil, I don't have a recommendation. I don't think they actually use real mink oil anymore. The stuff I used I had sitting around the house for years so it might have had real mink in it. It seemed a bit waxy.
Leather honey looks like honey. I didn't think I would like it because of that, but I painted it on with a paint brush and after awhile, it absorbed in. I used it on a bag that had mildew damage and it really improved it. I used multiple coats and it just kept soaking in.
Skidmore's is similar to Blackrocks but is easier to use and seems to soften the leather more. You don't have to be careful to not use too much like you do with Blackrocks. It doesn't give it quite the finishing sheen of Blackrocks though.
If there is a saddle shop nearby, they probably have some good products. After you find out what they have, you can google it or ask here if anyone knows anything about the products.
I did call today and they only had saddle soap and fiebings mink oil liquid which I believe I read had silicone in it. I had a feeling my options would be limited, I asked the local equestrians and they said they actually just bring in whenever they're travelling personally for their use.
