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You can call the columns whatever you like: 'loved' and 'read', 'war' and 'peace', 'simon' and 'garfunkel', 'batman' and 'robin'.
All I am suggesting is that their type should 'Text with a fixed set of values' (rather 'Yes/No') with permissible values as 'Y, N'. Then if value is 'Y' apply the desired icon. This way you're not replacing a pre-defined symbol with an icon.
I have no idea if this will be faster - if I were a betting man, I would say probably not, but I thought it was worth a shot.
BR
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