1. My memory is a bit fuzzy so ill try to find the thread, but I believe I read somewhere that temporary purrks like Spiritual Encounter can be used even if the permanent purrk slots are filled up
2. Based on the description of Purrk Reset i think you'd have to purchase it regardless of how many of the Purrks you want to change up/remove, but it seems resonable to only change one Purrk if you want (maybe ask nicely and bring staff fresh cookies just in case ?)
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Wingnettle