you can be almost certain sighax will ultimately really just be used as a fake signed a9lh FIRM (essentially using the same tried and tested chain loading method to load a cfw from the SD card), I don't see any real practical reason to try split the userbase between the 2 methods, it serves no purpose other than to start sighax master race meme's
and I think its fairly clear most people who want sighax would already be on a updated system with no a9lh, so any requests to redirect updates would almost certainly be trying to ask if they can just setup a Nintendo server proxy to install sighax on a stock system, which is not possible for several reason