Tool that mines a specific block faster

I want to know how to make a tool that mines a specific block faster; specifically, I want a pickaxe that mines obsidian faster than usual. I can't use the special tool type because a: I want it to be usable as a normal pickaxe, and b: the special tool type won't give you the block as a drop if it requires a mining level anyway (it's apparently glitched). The first idea I had was that if you were detected to be mining obsidian, it increases the tool's efficiency (or, failing that, simply gives you momentary Haste), but I couldn't get that to work; next, I tried making it so if you're looking at obsidian while holding it, you gain haste, but there doesn't seem to be any way to check that. I tried a few other things, none of which got far. Is this simply too ambitious for the limited MCreator software, or is there a way I simply cannot see?