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You could replace the keycaps - many people do with CoolerMaster keyboards (I did with both of mine). Unfortunately the TK has a non-standard bottom row so you'll find it a bit more difficult to find a keycap set that will completely fit.
MX blues are clicky - if you doin't like noisy switches or need to use the keyboard where others might be sensitive to the noise, and if the only thing wrong with the browns is that they are too light, perhaps MX clears would be more suitable?