The Pact system from Elric is highly portable to BRP, but it is designed to reflect specifically the Elric saga, so you might want to tone down some elements, like the 100% cult skill raise, or Eternal Life, to reflect the realities of your own campaign. But that's very easily done, and there's no reason why mechanics like this shouldn't be used in BRP. The forthcoming 'Cults of the Young Kingdoms' book has dozens of cult gifts resulting from a Pact that are more subtle in their effects, so this could be a source of inspiration if that's how you want your campaign to go.
Personally I never like or used the Allegiance system from the Chaosium Elric! game, and find that Pacts, Gifts and Compulsions reflect the saga far more accurately, but its really a matter of preference. Allegiance is eminently usable and will suit certain kinds of settings and campaigns better than Pacts.
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Pray, and pass the ammunition
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