No, not exactly.
Killua, as the wishmaker, is free from any responsibility or penalty that would come from making the wish. He orders the dinner, but it's the cooks who make the food, and the next person who has to pay the bill. He's not involved in the process in the same way. We've already been told that the person who makes the wish doesn't have to pay the price of the pestering, Killua makes the wish, but he doesn't have to pay. (He MAY however have to deal indirectly with the consequences of the next three HUGE pesterings).
The people who do the pestering are the ones whose lives are potentially fucked up.
The only reason those 67 people died (supposedly on the blimp) is because instead of the pestered person being someone random, it was the lover of the person who made the wish.
If Alluka's ability summons this super nen remover that can cure Gon, it's the nen remover that physically makes the removal happen. The nen-remover is the one at danger in my theory, and everyone involved in getting that nen-remover there - the number of which, if it's a big wish, increases proportional to the wish if the equivalent exchange of the pesterings are ignored. I feel like the 67 people involved died in this case only because the person who refused the pesterings was connected to the wish already, via her lover.
And the reason I settled on this theory instead of the yours, which I considered in the beginning, is because of what we know about the Zoldyck's servants – which I feel makes it pretty unlikely that it's the loved ones of the loved ones of the loved ones who die...
Remember that the Zoldyck's employ these specially trained servants that actually seriously love the Zoldyck's and feel extremely strongly about them. At least Killua's did. I feel like if you've got these every expanding circle from lover, to family, to friends, to coworkers, to boss... the risk of making big wishes with Alluka would potentially pose a very real threat to the Zoldycks themselves. I find it unlikely that with these kind of guards you'd get through 67 people close to them and not reach the Zoldyck's at some point.
Let's assume that Gon is Killua's most loved person. What Killua is planning to do with Gon, if he fails Milluki's unfulfilled pesterings, not only runs the risk of killing Killua and Gon, but everybody in the Zoldyck family. I find it highly, highly unlikely that Silva would allow this to happen if that were the case. The way he's spoken thus far, his concerns are the massive loss of other people's lives that Alluka's wishes have caused, and immediate concern for Killua's safety alone. Illumi, too, only seemed concerned with Gon and Killua dying, not the entire Zoldyck family. With how the Zoldycks surround themselves with these servants that not only work for them, but love them (to the point of tears), it just feels unlikely that your theory would be the case.
Of course this is all speculation, but I feel with the panel of the Blimp showing the casualties, the way Silva has spoken about it killing innocent people and other contextual clues that I'm on the right track.
I wouldn't mind being wrong though.
Whatever happens, we'll know more about Alluka's ability and how Killua will get around it in the coming days.