I have this same router and unless things have changed i could not put merlinwrt on it, however you can put tomato shibby firmware on it to have the ability to use up to 2 vpn clients in fact I just updated the firmware to tomato-K26-1.28.RT-N5x-MIPSR2-140-Max and it works fine I have 1 client running PIA Toronto the Other Nord for UK.
check it out here http://tomato.groov.pl/?page_id=69
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