Well they are very good indeed.
I don't have BLB, though i wonder if that may change at some point soonish. Do you have any suggestions for converting the scenario to Knave v1?
Its a fun game, uses d6s; I've run a few small campaigns using it - but I primarily work in making toolbox setting books so there's broad applicability regardless if people enjoy that set of math.
This all noted, there are official conversion notes in one of the BLB books; which I've included here:
Converting Advantages might be a bit harder, given the narrative nature of them in writing and the mechanical expression of them in BLB; but for ad hoc - the Candlemen are Elemental-type Ghouls, the Shaggyman is like a very fast Ogre-type thing, and Eradabbis would be some sort of tempter-type Devil. I'd say make his HD rather than "Grip" equal to the current day on the Island so as to make him an escalating power/challenge.
All the best, hope your conversion efforts go well and the game ends up fun for y'all.
- Brian