In HPM, the formation of Natalia gives them cores on all of your land. First, I conquered Matabele, puppeted Zulu, then puppet released Matabele. Next, conquered Lubeck, purposefully lost the rest of my land to Natalia to force my capital to Europe, and peaced out with Prussia. From there, reconquered Natalia with my two puppets. Declared on Montenegro, Mecklenberg, and Brunei (another HPM event needed) to be at war with Russia, Prussia, and the UK simultaneously. Occupied Brunei, let Lubeck be occupied by Mecklenberg, and gave my African land to Russia.
This way I became an OPM with 85% literacy while the terrible naval AI couldn't figure out how to take back Brunei. Switched my party to Liberal because it makes the upper 100% liberal which means -40% economic reform cost on top of the more than -40% cost from literacy. Passed my first reform January 1, 1843 when the new government formed and passed the last one exactly three years later. During that time, the Germans took care of the reactionary rebels for me, and I could add enough war goals in the Brunei war to take three Indian colonies and the Cape, preventing Oranje/Transvaal from forming.
Rank 10 after westernization and prestige farmed my way to GP status by May 15, 1848. I have 81% revanchism, an infamy dump, core truce breaks on Russia and the UK, and ultra high literacy to catch up on tech. Zulu is an absolute monster in HPM.