There's another problem, actually, though your point is spot on.
It's important to maintain the type when it comes to bonuses. So even when it does work, it won't carry the type.
I was working on All-in-One Monk this morning (coincidentally), so I just did Mountain Stance. Here's what I wanted to use should be like:
Mountain Stance; AC: +4 [-DEX] status; SPEED: -5; Falling Stone attack only
The status tag breaks it. Because there are other status bonus possibilities, it feels pretty important to maintain that tag. I ended up leaving it up to the players to adjust.
Mountain Stance; AC: +4 status; Reduce status bonus by DEX; SPEED: -5; Falling Stone attack only