However, internationalist strains of thought are currently far less influential within conservatism...
Crudely, about half the time, conservatives are in power. To help promote internationalist policy, which is vital to tackle global catastrophic risk and extreme poverty, we need to promote and strengthen existing internationalist schools of thought within conservatism, or even create new internationalist schools of thought within conservatism.
I think this gets the causation backwards.
Conservatism, like any other ideological cluster, does not exist independently of the real political movements that constitute it. There is no law of nature that says “conservatives”, in some abstract ideal sense, are going to be in power half of the time. Whatever level of success contemporary conservative parties have is a fact about actually existing conservatives, not “conservatism” as such. They’re not inherently traditionalists and only accidentally nationalists; they just have whatever traits they have, any combination of which might explain their success.
I think this gets the causation backwards.
Conservatism, like any other ideological cluster, does not exist independently of the real political movements that constitute it. There is no law of nature that says “conservatives”, in some abstract ideal sense, are going to be in power half of the time. Whatever level of success contemporary conservative parties have is a fact about actually existing conservatives, not “conservatism” as such. They’re not inherently traditionalists and only accidentally nationalists; they just have whatever traits they have, any combination of which might explain their success.
This is true, but not very informative...