One rule I'd seen (in @ironboundtome's blog) is the possibility of adding complexity magnitudes to reduce the Finesse EF:
The rule would be this:
Suggested new Guideline:
Caster gains +3 bonus to the Finesse check for each Magnitude added for Finesse Complexity in spell design. This complexity may only be added where the description also produces a higher quality and beauty item, and must produce a more specific result for each step in magnitude.
To close the loophole, on his blog he links this other thread here, where the spell Echo of Durendal was proposed by @virgileso: