I used a Rotary Platen on my variable speed belt sander, so it's cheating a bit
I slack belt the edge portion and then put in a small edge sharpening bevel or micro bevel type of an edge.
To get from one to the other by stones, you need to remove that sharp transition between the blade bevel and edge bevel. Start with the blade bevel (main blade grind) flat on the stone and lift the spine a little. This will get you on to that point. Start abrading away the steel. Now you should have your main blade grind or bevel, the new bevel (call it thinning bevel) you just made and then the edge sharpening bevel. You pretty much keep working the new thinning bevel down closer to the edge bevel and kinda blend the two together, or bring the thinning bevel down to the edge completely and then add back in a sharpening edge bevel. When people thin, they are usually thinning 3/16"-1/4" up the blade from the edge upwards to give you an idea. You aren't trying to thin the whole blade out, but the area where the blade grind and sharpening bevel meet up and reduce that sharp point there.