I didn't read it that way. I read it to mean that you were saying there was a strong interventionist component to conservative thought outside of the McKinley era as well as inside. My response was that pre-FDR interventionism was largely limited to the examples I provided.
However, why I am saying is that for decades before, and decades after, McKinley, the conservatives who dominated the Republican party were expansionist and believed in projecting force.
I don't know how "expansionist" they could have been. Our first acquisition outside the mainland was Alaska (purchased from Russia in 1869). Our first outside the continent was Hawaii (annexed in response to its own request in 1893). Before that, probably the most aggressive action on our part was the Mexican War, which was hugely controversial at the time.
As for projection of force, that's not the same as interventionism. One can believe in projection of force (as in: if you attack us, we'll take it to your front door) and non-intervention at the same time.