I feel like binding the Essence of Crab to World Master won't actually lock him into our plane of existence. FFS wouldn't allow it. In fact, we'd probably end up losing the Essence as well. However, since I don't particularly care about Crab Essence...
Yeah, I feel the same way about this.
There are many more tangible reasons to doubt the success of our "experiment" - some of them coming from Proxxy herself - and since no one else seems to have noticed this, here goes: Proxxy seems to be catching on pretty quickly about the whole process, to the point that she's almost dropping clues:
Here she reveals how she's acquiring a very developed, ordered understanding of the taxonomy of the warrens. She's filling out an "enum" (or an unchanging, unordered list) of different types of being inside the Warrens - illborn, spirit, human (this species-ist entry could be replaced by "normal biological entities", I guess), and so on, each a distinct, non-overlapping category. The way she's thinking is the way we should be thinking.
That has, admittedly, very slight value as a clue for us. But what she says next is more interesting:
She's cottoned on to the idea of a "manual reset" on the timer, which is something completely opposed to what we're trying - a complete re-fit of WorldMaster27's physical manifestation. Maybe there's a simple, one-action process required to get him to hang around a bit longer - not destroying the timer, as we're hoping in this case, but simply setting it back to its initial value.
And that in turn, reminds me - we're not actually providing any sort of physical embodiment for WorldMaster27 whatsoever. We're just giving him some spiritual essence, when in fact, he's already a spirit. Maybe what we need is a body, rather than an essence, to make WorldMaster whole again.
I reckon that we
could spring the trap again and reset the clock, but we don't have time. So here's my totally contrarian and entirely-unlikely-to-win-the-vote suggestion:
Ask Polydectes for a random spare body and quickly (quickly dammit!) mix that with the essence AND the spirit in the LSS.