Of course, the skills of being a good translator are not the same with the ones needed for being a good Merit Source, but seriousness is needed though, same as professionalism. This is why I said that I believe he can be given a chance to show how he could act on such position, also taking into account the fact that Pakistani board would need more merits transacted.
That's quite true in my opinion. Being professional in giving merits will surely make it fair for their local board and won't allow biased merit giving and merits being sent according to OP's criteria. I clearly understand why OP submitted a merit source application due to less circulation of merits in their local board and I would have done the same for my local board since we also doesn't have more merits in circulation and as far as the data that my local board is almost the same as his board when it comes to merit circulation.