Definitely agree with pass over 2♦. I'd bid 2♠ now, partner should realize we are protecting, and unless they have something unexpected, we'll be in 2♠. At IMPs in particular, going -200 occasionally isn't so bad. This also seems to be an assumed fit situation, but since there isn't a good way to show the second suit, if you're doubled, it will be a guess. Of course you *could* double 2♦, but this isn't the situation you expected. As a side note, what do you play in Direct seat over 1N? Did partner have a penalty double available?