Oh, so the 1/4 would just be like a subfloor? That sounds like a plan. The oak over the top would support you fine. Maybe sandwich 2 pieces of 1/4 wherever there isn't structure currently so you have more wood to nail the oak to. Not sure that makes sense. Double the 1/4 underneath in a way that won't raise the 1/4 profile on top? I hope you understand my meaning.