You shouldn't limp, and here's why. The reason is not that anyone would notice you have a different range limping because they won't at 5NL, the reason is what happened this hand.
The button did what you should do in his position, isolate the limper with a really wide range. perhaps any two cards, likely a bit tighther though.
Now, when you don't make a set you c/f the flop and lose 25c. If a 2 does come on the flop, how much are you going to get from villain on average? You need to get at least $2.25 since you flop a set about 1 time in 9. Considering his range is really really wide, do you think you will get half his stack on average when you flop a set? Then consider the situations when you do flop a set but end up losing the hand to a straight/flush/higher set and you can see it can only be profitable against a total maniac / spewtard
That kind of logic applies to any hand, not just small pocket pairs