Because Mirage can't use S1 and S2, it just comes down to the potential of Mirage vs Spirited Response x2. Based on what I've researched and asked, Spirited Responses should be better (purely for PP recovery). So yes, a gunslash like that would be ideal.
This is what I use.
I don't have Phrase Recovery, but as you said, that would be the next best step, alongside Radiating Grace 2 instead of 1.
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