So, one of the ways I've seen to represent focussed practitioners with refinement is to give them full evocation, but with their elements being sub-categories of one element--for example, a hydromancer might have evocation with the elements of water, ice, and entropy/disintegration.
What I'm wondering is if it would be reasonable to do this, only instead of evocation elements, to have one or two of those slots filled with related thaumaturgy themes (and if so, should you up the refresh cost)? For example, in Paranet Papers it describes healing and shapeshifting as refined water magic, so would it be acceptable to give a hydromancer evocation with the elements of water, biomancy, and transformation?
And if this isn't a good way to represent this, does anyone have suggestions for a better way? (Besides sponsored magic.)