I pay attention to the Demonolatry folks and like them just fine - but they are finally rediscovering the grims now, and appear to be on the cusp of a Second Grimoire Revival.
Magicians can make anything work, but the Dukante Sigils and enns are fabricated by S. Conolly. The only issue I see many running into now is one of quality control. For me I have to ask, whose mythic "sandbox" are you playing in?
From the perspective of Rupert Sheldrake’s Morphic Fields, things that have happened before have a higher probability of happening again, suggesting that the more a ritual, conjuration, or seal is used over centuries, the deeper the 'groove' it wears into reality (or maybe, in my view, it just becomes more part of The Story, the Big Dream).
So if that is true, and I think it is, might as well join a tradition that is centuries - perhaps even millennia-old. The Dukante system is a modern 'story,' but the Grimorium Verum and the Lesser Key maybe tap into established 'fields' that provide - in my experince (and YMMV) - a more solid, objective experience of the Underworld journey we are taking here.
Speaking to Julio's point. I have used the Lesser Key and the Grimorium Verum, and the manifestations are different. On a practical level, the GV manifestations are more solid and much darker, while the Lesser Key is more trippy and psychedelic. I have no real idea why, except I think each grim is a 'story' unto itself that various classes of daimons respond individually to.
The names may be the same, but they are very different in practice. The Astaroth of the Lesser Key is not the Astaroth of the GV. Yes, I am aware of the astrological "explanations' why they "really" are the same. Maybe they "the same" are at some deeper level, but who cares? I leave that to the theologians. The way i see it each grim (or lack of grim, or the Internet as a grim ) each creates story that modulates their manifestations to to a greater or lesser degree.
So there is a lot of fexibility to 'work' more Catholic, as I do, or more Luciferian, as Peter Grey does, or even Christo-Luciferian as the Church of Light and Shadow does (FYI: not a member, not advocating here)
With the pact-based grimoires such as the GV, you take - or as has happened to me - are taken on - an extreme Katabasis Underworld trip.
At that point all all the silly trad kit like knives, fasting (to become more dead, maybe) , the fumigations, and offerings (of flame, song and more) make more sense . As well as seeking intercessonary allies from the Above or the Below for the field trip you're taking seeking Power and maybe getting some Wisdom along the way.