Frum is one of those "good" conservatives, at least making a stab at being reasonable rather than giving in to the paranoia and conspiracy thinking that have overtaken much of your list.

Of the ones on your list that I recognize, he's closest to George Will. A quick google suggests that he may be like Wilkerson. I wasn't able to learn anything useful about Peter Hitchens.

He's actually the guy who coined the term "axis of evil". So I'm not sure if you're making a joke or if it's just a coincidence.

RationalWiki has a rather amusing, somewhat satirical take on him:

https://rationalwiki.org/wiki/David_Frum