One of the more interesting ideas I saw at the other place would be if Spain decided to make a move - mainly because of a misreading of the OP for that thread, when people assumed it was the Congo Free State when "Spanish Congo" was mentioned when in fact it was much further north, in the Nigeria/Cameroon area (more specifically, according to the Treaty of El Pardo, between the Niger and Ogoue Rivers - hence also including modern-day Equatorial Guinea and much of Gabon). Assuming an 18th/early 19th century POD, if Spain decided to make a move in the area beyond OTL's history of Spanish/Equatorial Guinea, it could be interesting to see the borders extend south (towards Congo-Brazzaville) and east into the modern Free State. Colonization here would take a different tone than in America and the Philippines, and is probably more pragmatic considering Spain's OTL political history in the meantime - providing an opportunity for some who want to get away from the turmoil, not to mention a substitute for the lost American colonies as they became independent. It wouldn't be unicorns and roses (colonization in Africa, let alone the rest of the Global South, was generally very horrendous for the colonized, and IOTL Spanish Guinea was no different on that score - even if the Civil War barely touched the colony), but Spain would definitely be an improvement over being Leopold II's personal property in the OTL Congo Free State area.