What do you call your own ideology?

[So rightwing that I broke the Political Compass!]

Interventionist libertarianism

This is an oxymoron.

Not really. Leftist social policies, right-wing economic policies, and an interventionist foreign policy. In America, when the first two are combined, we call that 'libertarian'. However, this usually comes with isolationism, so it's necessary to point out I am specifically an interventionist libertarian.

Unless you have a better idea?

A much better term for you would "postmodern conservative" or "nihilist conservative".