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I think if you were to give a few of the various humanoids several natural paths and a high (60-80) path cost this could help solve the problem with lack of diversity among human pretenders.

Right now they are all used as rainbow mages, and one rainbow mage is much like another. Making some of them ineffective in that role, for instance giving the druid 2 points in all four sorcery paths and prohibitive path cost with elements (just an example) would make a powerful multi role mage with a good potential blessing (maybe even dual 9s) which is still not a rainbow mage.

Such creatures would still be weak in combat and (unless used with a nation that has excellent blessability) probably worse than regular rainbow mages at more or less everything. But at least there would be some diversity.