I'd think the quickest way to make a nurgle themed force would be to restrict demon engine choices to nurgle ones (obviously), perhaps even avoiding the undivided options, and then taking plague zombies, perhaps even the maximum amount. Make sure all formations are bound to nurgle and stock up on nurgle demons and voila!
From a fluff perspective, I'm not sure fixed formation sizes relating to the sacred numbers are worth the effort of applying though. This is CHAOS after all, the kind of background associated with most underground chaos cults would make organised bodies of troops with set numbers unlikely. Chaos cults, despite their name, are distinct from marine cults insofar as chaos marine cults are marked by the chaos powers to a much greater extent. Each plague marine is in a sense practically an aspiring champion and probably there is thus more importance to the sacred numbers for that reason (plus, they also square with marine formations better!)
More specific troop organisations could be self imposed. Perhaps make sure the total number of TROOPS in each formation is divisible by seven. Seven stands of five is 35 troops, but is also a weak formation for LATD, and impossible in the base list. 49 men, 7x7 but also happily approximately 10x5, may be appropriate. 10x5 Cultists, and then some Mutant rabble who surely would not count as part of the coven = A respectable LATD formation!
Going further into creating an actual list to create a devout nurgle cult, perhaps the covens could be set at 10 stands, plus the command stand, with no cultists allowed to be added (but mutants permitted?). The nurglesque defiler from the Death Guard list could be added, as well as lifting the 0-2 cap on plaque zombies, but all non nurgle demon engines and demons could be removed. The coven could come down 25 points (a slight points break to take account of the fact you have much less choice).
I dont think that would be overpowered, except the plague zombies which might need testing.
_________________ They are free, yes, but not entirely free; for they have a master, and that master is Law.
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