I don't know anything about Dwimmermount other than some of the posts I saw on James's blog years ago. I do recall that James was an avid CAS fan, so if some of that worked its way into his dungeon, perhaps it would work well. 

Hm, I've been running Dwimmermount for my group (albeit not with AS&SH but Kazamaták és Kompániák, a Hungarian B/X clone), and it would certainly not be hard to "Hyperboreanise" it; some its elements (especially those which we can't discuss without spoilers) definitely fit the aesthetics of AS&SH.

As for Dwimmermount's dwarves, I can see several options. You can tweak the encounters with dwarves and their areas so that they match their Hyperborean version. So they wouldn't be custodians of the dungeon, rather slaves finally free from their masters. Plus, you know, the maggot-y thing. Alternatively, you may want to reskin them as some of homunculi.

Re: Dwimmermount Dwarves, Maggotty Beginings & Hyperborean Automatons?

@Ynas - Strangely, I hadn't thought about changing the dwarves to their hyperborean equivalents but now that you mention it that might work - and their generation from foul maggots could be used as well.  Thanks!

For those unfamiliar with Dwimmermount (no spoilers here I don't think, this is all knowledge available to those playing dwarves) - PC Dwarves in Dwimmermount are all male and reproduce in a rather unusual way: they carve a "son" from rock who is nearly identical to themselves and adorn their "son" with jewels and precious metals, and something about this magical process brings the dwarf to life.  When dwarves die they revert to stone, and they are regarded by non-dwarves as being somewhat artificial - like automatons / golems.  This suggests to me 2 options thus far:

1.) As Ynas Midgard pointed out, the Hyperborean Dwarves, who grow from foul maggots, have a similarly unusual reproductive process and could be substituted in.  There is even a certain resonance between the Dwimmermount Dwarves imbuing their "sons" with life and the Hyperborean dwarves ability to forge magic items.  The tricky bit in terms of adventure conversion is the generally lawful stance of Dwimmermount Dwarves vs. the relatively Chaotic stance of Hyperborean Dwarves.

2.) Another option after looking again at the ASSH referee's book is to change the Dwimmermount Dwarves into sentient Automatons - in a somewhat similar vein to the Warforged from 3.x editions but "wierded up" - just like the automatons in ASSH these would likely be the remnant creations of Atlantean, Hyperborean or older and stranger cultures, and this ties in quite well with the way that Dwimmermount Dwarves are seen as somewhat artificial.  I actually quite like the idea of (rare) sentient automatons wondering around the barbaric, frigid, post-apocalyptic Hyperborea.
 
Does anyone have any thoughts on how they would “weird” up a “race” of automatons for Hyperborea, or perhaps some literarcy antecedants / sources?