Would it work though?

It’s an AU mirror room, not a multiverse mirror room.

Besides, there isn’t much info about it. I’d love to see it in practice in order to know more about that concept, so I can’t say whether it’ll work or not.

Technically, yes. 

Here’s how I interpret Ink’s vials to amplify:

I think the stuff Ink has in his vials is some kind of liquid creativity that gets created when an AU is created, containing the creators’ emotions. Which is why he can drink them and get emotions AND which is why he ‘dies’ when people stop to create. I don’t think that Ink vanishes when there would be no more creativity, but he’d rather fall back to this blank, soulless state, which he’d consider his death since… well, it’s not really worth living like this, right?

So yes, Pale could drink that stuff because that’s EXACTLY what he’s trying to squeeze out of the created AUs by draining them.

Pale and Ink aren’t this different, aren’t they? ;3

To be honest, that’s the most difficult thing for me to wrap my head around in all of Ink’s decription. It was just stated in his bio and we’ve never seen him doing that, so I guess it’s all up on our own to fight an interpretation and maybe that’s the idea beind it.

You see, in my opinion art blocks can have different shapes and forms. So if either it’s simply a huge wall that blocks the flow of creativity or a a giant living black shadow attacking everything in sight or whatever comes to mind, Ink will fight it. Not to mention that you are being creative by giving that artblock a form, so you’re already kinda fighting it by thinking about it.

It’s a friendly reminder of no matter what you want to do and even if you are facing obstacles, there is always someone rooting and fighting for you in the background, even if you don’t see them doing it.

So yeah, it’s up to you to decide how an artblock looks like. Because there is more than just one interpretation.