Trying to convert skills, abilities and feats from d20 to brp by a formula is pointless in my opinion. You can't really measure the power of a character that easily, especially if you combine the right feats with magical items and spells. The work that is necessary to make a list of bonusses for hundreds (or thousands if you use all the books) of feats isn't worth it. Converting characters is more an art than a science.
I would look at the d20 character concept and transfer it to brp. That means a high level fighter who uses a longsword and spends nearly all of his feats to be better at combat would be something similar in brp. Just make a really good fighter and round him out with some background skills that seem to fit. It's faster and you get better results - the systems are too different for an 1:1 approach.
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