Masteries for BG

Sorry, if I missed this, but is there no way to change your masteries strictly for BGs? I recently became an arena grinder, but I simply don’t get as many BG wins with “ouchies” turned on. I don’t want to keep spending 70 units every other day to collect the BG rewards because it significantly decreases the value of my arena grind. Am I missing something or is that just how it is? Thanks for reading and any help would be appreciated.
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